Wall Ball Exercise
| English Name | Wall Ball |
|---|---|
| Difficulty | Intermediate |
| Exercise Types | پویا |
| Primary Muscle (EN) | Quadriceps Femoris |
| Muscle Groups | Full body Hips muscles Leg muscles Shoulder Muscles |
|---|---|
| Workout Type | Cardio Explosive Functional |
| Required equipment | Exercise ball |
💠 Exercise guide
The Wall Ball movement is a combination of a squat and throwing a medicine ball towards the wall, widely used in CrossFit and HIIT workouts. This exercise engages multiple muscle groups simultaneously, helping to enhance explosive power, muscular endurance, and improve neuromuscular coordination.
💠 How to perform the exercise
Preparation
✅ Stand facing the wall, about one to one and a half meters away
✅ Hold the medicine ball in front of your chest with both hands
✅ Feet slightly wider than hip-width apart, with toes slightly turned outward
✅ Keep your back and torso straight, engaging your core muscles
Execution method
✅ Perform a full squat until your hips are level with or slightly below your knees
✅ On the way up, simultaneously throw the ball towards the target point on the wall (usually 2.5 to 3 meters high)
✅ Catch the ball after it hits the wall and immediately begin the next repetition
✅ Breathing: Inhale while lowering, exhale during the throw
Coaching tips and recommendations
✔ Keep the throw height consistent to maintain proper form
✔ Avoid excessive bending of the back when catching the ball
✔ Perform the movement explosively and with control
✔ In HIIT or fat-burning programs, perform with high repetitions and moderate weight
✔ The torso should remain upright and the spine straight throughout the movement
Benefits of the exercise
The Wall Ball exercise is one of the most comprehensive functional movements that engages multiple body systems simultaneously. The combination of a squat with a throw not only strengthens the lower body but also keeps the upper body and core muscles active. Compared to a regular squat, this exercise adds an aerobic and explosive element, and due to the continuous throws, it increases heart rate and improves coordination between limbs.
Unlike a regular shoulder press, this exercise relies on movement momentum and throwing, requiring quick reactions, focus, and body form control. In terms of CrossFit training, the Wall Ball is one of the main pillars of rotational exercises and overall physical conditioning.
💠 Muscles engaged in the movement
The Wall Ball is a full-body movement where the quadriceps act as the primary muscle during the squat, while the shoulders, arms, and core muscles play a key role in throwing the ball and stabilizing the body. This exercise also engages the back muscles and calf muscles.
Main muscles
Synergistic muscles
Stabilizers
Quadriceps Femoris Muscle
Quadriceps Femoris Muscle
The quadriceps femoris is one of the strongest and most important muscles of the leg, located at the front of the thigh. It plays a key role in knee extension, stabilizing the knee joint, and hip flexion.
🔹 The quadriceps group consists of four separate muscles that work together:
1️⃣ Rectus Femoris – the only quadriceps muscle that crosses the hip joint and affects hip movement.
2️⃣ Vastus Lateralis – the largest quadriceps muscle, located on the outer side of the thigh.
3️⃣ Vastus Medialis – the inner muscle that helps stabilize the kneecap (patella).
4️⃣ Vastus Intermedius – the deep quadriceps muscle situated beneath the rectus femoris.
✅ Persian Name: Chaharsar Rani
✅ Latin Name: Quadriceps Femoris
✅ Common Names: Front Thigh Muscle, Quads
✅ Location:
🟡 Located at the front of the thigh, originating from the pelvis and femur.
🟡 Connected to the kneecap (patella) via the common quadriceps tendon, which then attaches to the tibia.
🟡 It is the primary knee extensor and plays an essential role in walking, running, jumping, and sitting.
✅ 🦾 Origin
✔ Rectus Femoris: Anterior Inferior Iliac Spine (AIIS)
✔ Vastus Lateralis: Lateral surface of the femur
✔ Vastus Medialis: Medial surface of the femur
✔ Vastus Intermedius: Anterior and lateral surfaces of the femur
✅ 🦿 Insertion
✔ All four muscles converge into the quadriceps tendon.
✔ The quadriceps tendon attaches to the kneecap (patella), which connects via the patellar ligament to the tibial tuberosity on the shinbone (tibia).
✅ 📌 Function
✔ Knee extension – straightening the knee, as seen in squats and jumping
✔ Knee stabilization – maintaining knee balance during standing and movement
✔ Hip flexion – performed only by the rectus femoris muscle
🔹 Movement Example: Active during stair climbing, running, and lifting weights in squats.
✅ 💪🏻 Muscle Fiber Types
✔ A combination of ✔ A combination of slow-twitch fibers (Type I) and fast-twitch fibers (Type II).
✔ Type I fibers for endurance during walking and standing.
✔ Type II fibers for fast, powerful contractions in activities like sprinting and jumping.
✅ 🏋🏻♂️ Role in Motor and Athletic Performance
✔ Plays a key role in all strength, endurance, and speed-based sports.
✔ Essential for weightlifters, runners, basketball players, and gymnasts.
✅ 🧗🏻♂️ Muscle Strength and Endurance
✔ Strengthening this muscle improves movement performance and helps prevent knee injuries.
✔ Weakness, especially in the vastus medialis, can lead to kneecap discomfort known as Patellar Tracking Disorder.
🧠 Innervation
✔ Femoral nerve (L2, L3, L4)
🩸 Blood Supply
✔ Femoral artery and its branches, including the deep femoral artery.
✅ 🤼♂️ Role in Sports and Physical Activities
✔ Bodybuilding: Vital in squats, lunges, and leg presses.
✔ Soccer and Basketball: Essential for running and quick direction changes.
✔ Track and Field: Key for acceleration and high jumps.
✔ Cycling: Responsible for generating power during pedaling.
✅ 🏌🏻♂️ Interaction with Other Muscles and Joints
✔ Works in coordination with the gluteal muscles, hamstrings, and calf muscles to stabilize leg movements.
✔ Strengthening this muscle enhances knee stability and reduces joint injuries.
✅ 💉 Vulnerability and Potential Issues
✔ Quadriceps strains commonly occur in sports involving sudden movements.
✔ Quadriceps tendinitis can develop from intense training without adequate rest.
✔ Weakness in this muscle increases stress on the knee, leading to problems like Patellofemoral Pain Syndrome (PFPS).
✅ 🏋🏻♂️ Key Exercises to Strengthen the Quadriceps
1️⃣ Squats – the most effective exercise for the quads
2️⃣ Leg Press – focuses on knee extension
3️⃣ Lunges – improves knee strength and stability
4️⃣ Step-Ups – enhances functional muscle capacity
5️⃣ Leg Extensions (machine) – isolates the quadriceps for targeted strengthening
✅ 🧘🏻♀️ Stretching and Recovery
✔ Standing Quad Stretch
✔ Seated Quadriceps Stretch
✔ Foam Rolling to enhance recovery and reduce muscle tension
✅ Interesting Fact
✔ The quadriceps femoris is the strongest knee extensor muscle in the body!
✔ The rectus femoris is the only muscle in this group that also crosses and acts on the hip joint.
✅ Practical Tip
✔ To prevent knee injuries, strengthening the quadriceps along with the hamstrings and gluteal muscles is essential.
✔ Combining strength exercises (like squats and lunges) with stretches (such as the Standing Quad Stretch) improves performance and reduces injury risk.
🔴 Name and Location: A group of four muscles at the front of the thigh, attaching to the kneecap.
🟠 Anatomy: Comprises four parts—rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
🟡 Function: Knee extension, knee stabilization, and hip flexion (only by rectus femoris).
🟢 Physiology: A mix of slow- and fast-twitch fibers for both strength and endurance.
🔵 Innervation: Femoral nerve (L2–L4).
🟣 Exercises: Squats, lunges, step-ups, leg press.
⚫ Interesting Fact: The strongest knee extensor muscle group in the body!
Gluteus Maximus Muscle
Gluteus Maximus Muscle
The gluteus maximus is one of the most important and powerful muscles in the body, playing a key role in hip movement, balance, and pelvic stability. It’s essential for strength-based activities like squats, deadlifts, and running, where it drives hip extension and helps maintain pelvic stability.
✅ Persian Name: Sorini Bozorg
✅ Latin Name: Gluteus Maximus
✅ Common Name: Buttock Muscle, Glutes
✅ Location:
🟡 Located at the back of the pelvis, lying over the other gluteal and thigh muscles.
🟡 It is the largest and most superficial muscle in the gluteal region.
🟡 Originates from the ilium (hip bone) and sacrum, attaching to the iliotibial band and the femur.
✅ 🦾 Origin
✔ Posterior surface of the ilium (Ilium)
✔ Posterior surface of the sacrum (Sacrum) and coccyx (Coccyx)
✔ Sacrotuberous ligament (Sacrotuberous Ligament)
✅ 🦿 Insertion
✔ Iliotibial band (IT Band)
✔ Gluteal tuberosity of the femur
✅ 📌 Function
1️⃣ Hip extension (moving the hip backward, as in deadlifts and climbing stairs)
2️⃣ External rotation of the hip (turning the thigh outward, like in lateral lunges)
3️⃣ Hip abduction and adduction (moving the thigh away from or toward the body, depending on muscle fibers)
4️⃣ Stabilizing the pelvis and knee through the iliotibial band (IT Band)
✅ 💪🏻 Muscle Fiber Types
✔ Contains fast-twitch fibers (Type II) for powerful movements like deadlifts and squats.
✔ Also includes slow-twitch fibers (Type I) to maintain balance and stability during static positions.
✅ 🏋🏻♂️ Role in Movement and Athletic Performance
✔ Bodybuilding: Engaged in key exercises like squats, deadlifts, and hip thrusts.
✔ Running and Jumping: Generates the force needed for propulsion and acceleration.
✔ Endurance and Balance: Supports static activities such as prolonged standing and walking.
✅ 🧗🏻♂️ Muscle Strength and Endurance
✔ The strongest muscle in the body when it comes to hip extension power.
✔ Weakness can lead to pelvic imbalance, increased lumbar lordosis (excessive lower back curve), knee pain, and reduced athletic performance.
🧠 Innervation
✔ Inferior gluteal nerve (L5, S1, S2)
🩸 Blood Supply
✔ Superior and inferior gluteal arteries
✅ 🤼♂️ Role in Sports and Physical Activities
✔ Weightlifting: Drives hip extension in deadlifts, squats, lunges, and hip thrusts
✔ Running and Jumping: Aids in acceleration and pelvic stabilization
✔ Resistance Sports: Enhances knee and pelvic stability for dynamic movements
✅ 🏌🏻♂️ Interaction with Other Muscles and Joints
✔ Works alongside the gluteus medius and minimus to control hip movements
✔ Collaborates with the hamstrings for hip extension and pelvic stabilization
✔ Stabilizes the knee through the iliotibial band (IT Band)
✅ 💉 Vulnerability and Potential Issues
✔ Weakness in the gluteus maximus increases the risk of lower back pain, knee problems, and poor balance.
✔ Insufficient strengthening can lead to muscle spasms and pain in the gluteal region.
✅ 🏋🏻♂️ Strength Training Exercises to Build the Gluteus Maximus
1️⃣ Deadlifts – the primary movement for hip extension
2️⃣ Hip Thrusts – directly target the gluteus maximus
3️⃣ Weighted Squats – a compound exercise strengthening both glutes and hamstrings
4️⃣ Lunges – work the gluteus maximus while challenging balance
5️⃣ Glute Bridge – an excellent exercise to engage the muscle at home
✅ 🧘🏻♀️ Stretching and Recovery Exercises
✔ Glute Stretch to relieve muscle spasms and enhance function
✔ Pigeon Pose to increase gluteal flexibility and reduce lower back tension
✅ 🔬 Interesting Fact:
✔ The gluteus maximus plays the biggest role in shaping and powering the lower body.
✔ In professional athletes, this muscle is often highly developed due to intense training.
✅ 💡 Practical Tip:
✔ To better activate the gluteus maximus during workouts, start with activation exercises like bodyweight glute bridges and lunges before your main training.
🔴 Name and Location: The largest and most superficial muscle in the gluteal region, attaching to the hip bone (ilium) and the femur.
🟠 Anatomy: Originates from the ilium and sacrum, attaching to the gluteal tuberosity of the femur and the iliotibial band.
🟡 Function: Hip extension, external rotation, and stabilization of the pelvis and knee.
🟢 Physiology: A blend of slow-twitch and fast-twitch muscle fibers, providing both strength and endurance.
🔵 Innervation: Inferior gluteal nerve (L5, S1, S2)
🟣 Importance: Active during weightlifting, running, jumping, and lower body movements
🟤 Exercises: Deadlifts, hip thrusts, squats, lunges, glute bridges
⚫ Interesting Fact: The most important muscle for… shaping and strengthening the lower body, as well as preventing lower back pain.
Anterior Deltoid muscle
Anterior Deltoid Muscle
🔹 The anterior deltoid is one of the three parts of the deltoid muscle. Its primary functions are moving the arm forward (flexion), internal rotation, and assisting in horizontal shoulder movements. This muscle plays a key role in many upper-body exercises, especially strength training movements like bench press, front raises, and throwing actions.
🔹 The anterior deltoid is one of the most important muscles involved in pressing and pushing movements. Due to its engagement in many strength exercises, it is often well-developed among athletes and bodybuilders. However, overusing this muscle without strengthening the posterior shoulder muscles (posterior deltoid and rotator cuff) can lead to muscular imbalances and increase the risk of shoulder injuries.
✅ Persian Name: Deltoid Ghodami
✅ Latin Name: Anterior Deltoid
✅ Common Names: Front part of the deltoid muscle | Anterior head of the shoulder
✅ Location:
🟡 Located at the front of the shoulder, forming the anterior part of the deltoid muscle.
🟡 Originates from the clavicle and lies over the upper part of the humerus.
🟡 Alongside the middle and posterior parts of the deltoid, it acts as part of the shoulder cap and assists in arm movements.
✅ 🔹 Origin
✔ Anterior surface of the lateral third of the clavicle (Clavicle – Anterior Surface of Lateral Third)
✅ 🔹 Insertion
✔ Deltoid tuberosity on the humerus bone (Deltoid Tuberosity, Humerus)
✅ 🔹 Function
📌 Primary functions of the anterior deltoid:
✔ Arm flexion – moving the arm forward (like raising the hand in front of the body)
✔ Internal rotation of the arm – rotating the arm inward toward the body
✔ Assisting in horizontal adduction – moving the arm inward on a horizontal plane (such as during a chest fly)
✔ Helping stabilize the shoulder joint during upper-body movements
📌 Movements that activate the anterior deltoid:
✔ Raising the arm forward (such as front raises)
✔ Throwing movements (ball throws, javelin throws)
✔ Moving weights in pressing and fly exercises
✅ 💪🏻 Muscle Fiber Types
✔ A combination of fast-twitch fibers (Type II) and slow-twitch fibers (Type I)
✔ Predominantly composed of fast-twitch fibers for rapid and powerful movements
✔ This characteristic makes the anterior deltoid highly active in explosive and strength exercises like weightlifting and throwing
✅ 🏋🏻♂️ Role in Sports and Physical Activities
✔ Active in all pressing, throwing, and forward arm-raising exercises
✔ Plays a key role in strength sports, bodybuilding, weightlifting, boxing, and discus throwing
✔ An important muscle in daily activities such as lifting objects and carrying items
✅ 🧗🏻♂️ Strength and Endurance
✔ Requires high strength for pressing exercises and overhead movements
✔ Overdevelopment can lead to muscular imbalances and increase the risk of shoulder injuries
✅ 🧠 Innervation
✔ Axillary nerve (C5, C6), which controls the movements of this muscle.
✅ 🩸 Blood Supply
✔ Posterior Circumflex Humeral Artery
✔ Thoracoacromial Artery
✅ 🤼♂️ Role in Sports and Physical Activities
✔ One of the key muscles for pushing and pressing movements in bodybuilding and weightlifting
✔ Active in throwing sports, swimming, boxing, gymnastics, and pulling movements
✔ Weakness can reduce pressing strength and increase the risk of shoulder injury
✅ 🏌🏻♂️ Interaction with Other Muscles and Joints
✔ Closely connected with the middle deltoid, pectoralis major, rotator cuff muscles, and triceps brachii
✔ Weakness in this muscle can lead to excessive strain on the shoulder joint and reduced upper body strength
✅ 💉 Vulnerability and Potential Issues
✔ One of the muscles prone to inflammation and strain due to high activity in upper-body training
✔ Weakness can cause excessive strain on the pectoral and shoulder muscles, leading to shoulder injuries
✅ 🏋🏻♂️ Strength Training Exercises for the Anterior Deltoid
1️⃣ Front Raise with Dumbbells – the most important exercise for strengthening the anterior deltoid
2️⃣ Overhead Shoulder Press with Dumbbells or Barbell – high engagement of the anterior deltoid
3️⃣ Arnold Press – simultaneous strengthening of all deltoid parts with emphasis on the anterior head
4️⃣ Incline Bench Press – combined strengthening of the anterior deltoid and pectoralis major
5️⃣ Close-Grip Push-ups – bodyweight exercise targeting this muscle
✅ 🧘🏻♀️ Stretching and Recovery
✔ Stretching the arm forward and across the body to improve flexibility and prevent muscle tightness
✔ Using a foam roller to reduce muscle tension and enhance blood flow
✅ Fun Fact
✔ The anterior deltoid is most engaged in throwing movements, which is why athletes in discus, javelin, and boxing typically have a very strong anterior deltoid.
✅ Practical Tip
✔ Overdeveloping the anterior deltoid without balancing it with the posterior deltoid can lead to muscular imbalances and increased stress on the shoulder joint.
🔴 Name and Location: A superficial muscle located at the front of the shoulder joint, originating from the clavicle.
🟠 Anatomy: Part of the deltoid muscle that, along with the middle and posterior deltoids, surrounds the shoulder and attaches to the humerus.
🟡 Function:
✔ Arm flexion – moving the hand forward
✔ Internal rotation of the arm – rotating the hand inward
✔ Horizontal adduction – assisting in bringing the arm inward on a horizontal plane
🟢 Physiology: Composed mainly of fast-twitch fibers, which provide power and speed in pressing movements.
🔵 Innervation: Axillary nerve, which controls the movements of this muscle.
🟣 Importance: Plays a vital role in pressing exercises, throwing, bodybuilding, boxing, and strength sports.
🟤 Exercises:
✔ Front raise
✔ Shoulder press
✔ Arnold press
✔ Incline bench press
✔ Close-grip push-ups
⚫ Fun Fact: One of the most utilized muscles in throwing and pressing movements, which, if overdeveloped, can lead to muscular imbalances and shoulder injuries.
Latissimus dorsi muscle
Latissimus Dorsi Muscle
The latissimus dorsi is one of the strongest and widest superficial back muscles, playing a crucial role in pulling movements, backward bending, and internal rotation of the arm. It extends from the lower spine to the humerus and is responsible for generating pulling force in exercises like pull-ups, swimming, and rowing. Strengthening this muscle enhances pulling power, improves body posture, and reduces the risk of lower back and shoulder injuries.
✅ Persian Name: Poshti bozorg
✅ Latin Name: Latissimus Dorsi
✅ Common Name: Lat
✅ Location:
🟡 A superficial muscle that connects from the lower spine, ribs, and pelvis to the humerus (upper arm bone).
🟡 A large, broad muscle located on both sides of the back, covering most of the lumbar and dorsal regions.
🟡 Responsible for pulling movements, arm adduction, and internal rotation of the arm.
✅ 🦾 Origin
✔ Lower six thoracic vertebrae (T7-T12)
✔ Lumbar vertebrae (L1-L5)
✔ Sacrum
✔ Iliac crest
✔ Lower ribs (9th to 12th)
✅ 🦿 Insertion
✔ Humerus (intertubercular groove)
✅ 📌 Function and Roles
🔹 The latissimus dorsi plays a role in various movements, including pulling, arm adduction, and internal rotation of the shoulder:
1️⃣ Pulling the arm down and back (Adduction)
✔ Like pulling the bar down during a lat pulldown exercise.
2️⃣ Internal rotation of the arm
✔ Like moving the arm inward during swimming and ball throwing.
3️⃣ Extension of the arm backward
✔ Like pulling the arm backward during pull-ups and rowing exercises.
✅ Main Functions:
✔ Lowering the arm and generating pulling force
✔ Assisting in shoulder stabilization during sports movements
✔ Increasing muscular endurance in strength exercises
✅ 💪🏻 Muscle Fiber Types
✔ A combination of slow-twitch fibers (Type 1) for endurance and fast-twitch fibers (Type 2) for power movements.
✔ The middle section contains more slow-twitch fibers and is active during sustained pulling movements.
✔ The lower section has fast-twitch fibers used in explosive power movements.
✅ 🏋🏻♂️ Role in Motor and Sports Performance
✔ The most important muscle in pulling movements such as pull-ups, swimming, and weightlifting.
✔ Plays a significant role in rowing, swimming, wrestling, and gymnastics.
✔ Strengthening this muscle increases pulling power, improves endurance, and reduces lower back injuries.
✅ 🧗🏻♂️ Muscle Strength and Endurance
✔ This muscle plays a key role in all pulling and strengthening movements of the upper body.
✔ Weakness in this muscle reduces endurance and increases stress on the lumbar and cervical vertebrae.
🧠 Innervation | Neural Control
✔ Thoracodorsal nerve (C6, C7, C8)
🩸 Blood Supply
✔ Thoracodorsal artery
✅ 🤼♂️ Role in Sports and Physical Activities
✔ Vital in sports such as bodybuilding, swimming, wrestling, rock climbing, and gymnastics.
✔ Plays a key role in shot put, cable pulling, weightlifting, and swimming.
✅ 🏌🏻♂️ Relationship with Other Muscles and Joints
✔ Interacts with the deltoid muscle, rotator cuff muscles, and teres major muscle.
✔ Weakness in this muscle leads to reduced pulling strength and pain in the lower back and shoulders.
✅ 💉 Vulnerability and Potential Issues
✔ Strain or weakness in this muscle can lead to lower back problems and pain in the upper back and shoulders.
✔ Weakness increases stress on the lumbar and cervical vertebrae.
✅ 🏋🏻♂️ Key Exercises to Strengthen the Latissimus Dorsi
1️⃣ Pull-Ups – The most effective exercise for full lat engagement
2️⃣ Lat Pulldown – Increases arm pulling strength
3️⃣ Bent-Over Barbell Rows – Builds size and strength in the back
4️⃣ One-Arm Dumbbell Rows – Strengthens the lateral and upper sections of the muscle
5️⃣ Deadlifts – Enhances endurance and strengthens the entire posterior chain
✅ 🧘🏻♀️ Stretching and Recovery Exercises
✔ Overhead Lat Stretch – Improves range of motion and reduces muscle tension
✔ Wall Lat Stretch – Increases flexibility during pulling movements
✅ Interesting Fact:
✔ The latissimus dorsi is one of the broadest muscles in the human body and plays a role in numerous daily and sports movements.
✅ Practical Tip:
✔ To better strengthen this muscle, combine compound exercises like deadlifts and pull-ups with isolation movements such as lat pulldowns.
🔴 Name and Location: A broad back muscle extending from the lower spine to the arm
🟠 Anatomy: Originates from lumbar and thoracic vertebrae and ribs, attaching to the humerus
🟡 Function: Pulling, lowering, and internal rotation of the arm
🟢 Physiology: A mix of slow- and fast-twitch fibers for endurance and strength
🔵 Innervation: Thoracodorsal nerve (C6, C7, C8)
🟣 Importance: Active in bodybuilding, swimming, wrestling, weightlifting, and rock climbing
🟤 Exercises: Pull-ups, lat pulldown, rowing, deadlifts, arm stretches
⚫ Interesting Facts: One of the broadest muscles in the body and the key muscle in pulling movements
Muscle training
Pelank is a comprehensive encyclopedia of the body’s muscles, providing an accurate and scientific review of all muscles. Below, you can find muscle groups. By clicking on each muscle group, you will have access to complete information about it, including:
1️⃣ Basic information about the muscle
2️⃣ Muscle anatomy
3️⃣ Muscle physiology
4️⃣ Innervation and blood supply
5️⃣ Importance of the muscle in the body and sports
6️⃣ Strengthening exercises
7️⃣ Scientific and interesting facts
📌 At the end, a summary review of each muscle will be provided.
Body muscles training guide link
🔹 The muscle group engaged in this movement is highlighted in color.
References
Anatomy and medical books :
- Gray’s Anatomy (one of the standard references in anatomy).
- Netter’s Atlas of Human Anatomy (a famous visual atlas in anatomy).
- Clinically Oriented Anatomy by Keith Moore
Sports and training references :
- Strength Training Anatomy by Frederic Delavier
- Essentials of Strength Training and Conditioning by NSCA
- Well-known articles and training programs by international coaches
Medical databases :
- PubMed (for scientific and research articles)
- MedlinePlus (health and medical information)
- WebMD (for practical and general health information)
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