Gym & Training

Burpees

Burpees combine a squat, push-up, and jump into one explosive full-body movement. The chest, shoulders, and triceps work during the push-up phase, the quadriceps and glutes power the jump, and the core stabilizes throughout every transition. Heart rate spikes immediately, making it both a strength and conditioning exercise.

Primary Muscles

quadricepschestshouldersglutes

Supporting Muscles

tricepsabdominalshamstringscalveslower back

Primary Muscles

Thigh

rectus femoris

The rectus femoris is the central quad muscle crossing both hip and knee, visible as the teardrop above your knee. It flexes the hip and extends the knee, powering sprints, jumps, and squats. Balanced development prevents knee pain in athletes.

Thigh

vastus intermedius

Deep central quad muscle under rectus femoris, extends knee powerfully. Core quad for squats and jumps.

Thigh

vastus lateralis

Largest quad on outer thigh, massive knee extender for lateral stability in lunges and sprints.

Thigh

vastus medialis

Teardrop inner quad (VMO) stabilizes patella, key for knee health in deep squats.

Chest

Abdominal part of left pectoralis major

The abdominal part of the left pectoralis major is the lower portion of the left chest's primary pushing muscle, attaching from the sternum down to the ribs near the abdomen. It drives shoulder adduction and flexion, crucial for powerful presses like bench variations and dips. Fitness enthusiasts target it for that defined lower chest line in bodybuilding.

Chest

Abdominal part of right pectoralis major

The abdominal part of the right pectoralis major forms the lower section of the right chest's main power muscle, spanning from the sternum to the abdominal ribs. It excels in adduction and flexion for presses and flyes, key for balanced chest development. Gym-goers love it for carving out that teardrop lower chest aesthetic.

Chest

Anterior papillary muscle of right ventricle

This cardiac muscle inside the right ventricle anchors mitral valve leaflets for proper heart pumping. Not skeletal, but endurance training optimizes heart efficiency. Matters for cardio performance indirectly.

Chest

Anterolateral head of lateral papillary muscle of left ventricle

Specialized head of left heart papillary muscle securing mitral valve for left ventricle ejection. Critical for oxygenated blood flow. Athletes benefit from cardiac hypertrophy here.

Chest

External intercostal muscle

External intercostals are thin muscles between the ribs that elevate them during inhalation, aiding deep breathing for core stability in lifts. They're vital for endurance athletes needing efficient oxygen uptake. Fitness training enhances respiratory muscle power.

Chest

Innermost intercostal muscle

Innermost intercostals are deep rib muscles aiding forced expiration like coughing. Support breathing in high-intensity training.

Chest

Internal intercostal muscle

Internal intercostals between ribs assist expiration and stabilize chest in lifts.

Chest

Lateral papillary muscle of left ventricle

Papillary muscle in heart's left ventricle anchors mitral valve to prevent backflow. Endurance training strengthens indirectly.

Chest

pectoralis major

The massive pectoralis major covers the chest, powering arm adduction, flexion, and rotation for bench presses and push-ups. It's the prime mover for upper body pushing strength in fitness. Building it creates that powerful chest aesthetic.

Chest

pectoralis minor

Under the pec major, the pectoralis minor stabilizes the scapula, aiding shoulder protraction in dips and push-ups. Key for shoulder health in overhead athletes. It prevents winging scapula in fitness training.

Chest

transversus thoracis

The transversus thoracis are thin muscle bands on the inner chest wall beneath the sternum. They compress the chest during forced exhalation and stabilize the ribs. Important for deep breathing control in fitness and core stability.

Upper Arm

coracobrachialis

The coracobrachialis is a small shoulder flexor deep in the upper arm, bridging coracoid to humerus. It flexes and adducts the arm, stabilizing shoulder in presses. Adds inner arm density for balanced delts.

Shoulder

deltoid

The deltoid is the rounded shoulder cap muscle with anterior, middle, and posterior fibers covering the shoulder joint. It abducts, flexes, and extends the arm for raises and presses. Builds the V-taper and protects the rotator cuff.

Shoulder

infraspinatus muscle

Infraspinatus caps the back of the shoulder blade, externally rotating the arm for throwing and serving. Key rotator cuff muscle for shoulder stability in presses and pulls.

Chest

serratus anterior

Serratus anterior wraps from ribs to scapula, protracting and upwardly rotating the shoulder blade for punches and presses. 'Boxer's muscle' prevents winging, crucial for overhead athletes.

Shoulder

subscapularis

The subscapularis is the anterior rotator cuff muscle filling the scapula's subscapular fossa. It internally rotates the arm and stabilizes the shoulder joint. Crucial for fitness in presses, pulls, and preventing dislocations.

Shoulder

supraspinatus

The supraspinatus tops the rotator cuff on scapula's fossa, initiating shoulder abduction. Vital for overhead presses and impingement prevention in weight training.

Shoulder

teres major

The teres major is a thick muscle from lower scapula to humerus, adducting and internally rotating the arm. 'Lat's little helper' for pulling exercises like rows and pull-ups.

Shoulder

teres minor

The teres minor is a narrow rotator cuff muscle on scapula's lateral border, externally rotating and stabilizing the shoulder. Key for throwing and pressing without winging.

Hip

gemellus inferior

Small deep rotator in the hip, gemellus inferior laterally rotates and stabilizes the thigh. Works with piriformis in squats and pivots. Crucial for hip control in sports.

Hip

gemellus superior

Tiny hip muscle above ischial spine, gemellus superior laterally rotates femur. Assists in twisting sports and hip stability. Part of deep six rotators.

Hip

gluteus maximus

Largest hip muscle, gluteus maximus extends and externally rotates thigh for powerful hip thrust in squats, deadlifts, running. King of posterior chain.

Hip

gluteus medius

Side hip muscle for abduction and stabilization during single-leg stance in running, squats. Prevents Trendelenburg gait.

Hip

gluteus minimus

Deepest glute under medius, minimus abducts and internally rotates hip. Key stabilizer for balance in yoga, hiking.

Hip

piriformis

The piriformis is a deep hip rotator in the glutes, externally rotating the hip for balance in squats and deadlifts. Tightness often causes sciatica-like pain. Essential for hip mobility in athletes.

Hip

quadratus femoris

Deep hip external rotator between ischium/femur for leg stability in single-leg work. Prevents twisting injuries in sports.

Supporting Muscles

Forearm

anconeus

Tiny elbow extensor at back upper forearm, stabilizes during pressing and gripping. Aids triceps in extensions. Powerlifters note its elbow lockout role.

Upper Arm

triceps brachii

The triceps brachii is the horseshoe-shaped muscle on the back of your upper arm with three heads. It extends the elbow for pushing movements like bench presses and dips. Crucial for arm strength, lockouts in lifts, and overall upper body power.

Abdomen

Diaphragm

The diaphragm is the dome-shaped breathing muscle separating chest from abdomen, contracting to inhale. Central tendon anchors it, essential for core bracing in lifts and endurance.

Pelvis

External anal sphincter

The external anal sphincter is a skeletal muscle ring around the anus that you can consciously control for bowel movements. It maintains continence during daily activities and is strengthened via Kegels for pelvic floor health. Important for athletes in high-impact sports to prevent incontinence.

Abdomen

external oblique

External obliques form the outer 'V' of your abs on each side, rotating and side-bending the torso while compressing the abdomen. They're powerhouse muscles for rotational power in sports like golf, boxing, and throws. Train them for a defined waist and core stability.

Hip

iliacus

The iliacus is the fan-shaped hip flexor filling your pelvis bowl, partnering with psoas to lift the thigh. Crucial for running, kicking, and rising from sits. Tight iliacus contributes to anterior pelvic tilt and lower back strain in fitness enthusiasts.

Abdomen

psoas major

The psoas major is a deep hip flexor from spine to thigh, lifting knees in running/squats. Core to posture and power; tightness causes low back pain.

Pelvis

pubococcygeus

Part of pelvic floor, the pubococcygeus supports bladder/bowel, aids continence and core stability. Crucial for intra-abdominal pressure in heavy lifts like squats.

Thigh

biceps femoris

The biceps femoris is the lateral hamstring on the back of the thigh, with long and short heads forming a thick band from hip to knee. It flexes the knee, extends the hip, and rotates the leg outward, vital for running, jumping, and deadlifts. Key for posterior chain power and injury prevention.

Thigh

gracilis

Long, thin medial thigh muscle adducting and flexing knee. Aids cutting movements in soccer, stabilizing in squats.

Lower Leg

popliteus

The popliteus is a small knee muscle behind the joint that 'unlocks' the knee from full extension for flexion. Crucial for downhill running and pivoting in sports. Prevents knee hyperextension.

Thigh

semimembranosus

The semimembranosus is a posterior thigh hamstring forming the teardrop at knee back, flexing knee and extending hip. Powers deadlifts, lunges, and deceleration in sports. Prevents ACL strains by stabilizing.

Thigh

semitendinosus

Semitendinosus is the slender medial hamstring with a long tendon, flexing knee and extending hip. Aids in medial knee stability for cutting sports. Complements semimembranosus for balanced posterior chain.

Foot

Abductor digiti minimi of left foot

This small muscle on the outer edge of the left foot spreads the little toe away from the others, aiding balance and push-off in gait. It's vital for foot arch stability during running or lateral movements. Runners and athletes appreciate its role in preventing foot pronation issues.

Foot

Abductor digiti minimi of right foot

This muscle runs along the outer arch of the right foot, abducting the little toe to support lateral stability and toe-off in walking. Essential for preventing supination injuries in trail running. It matters for overall foot mechanics in dynamic sports.

Foot

abductor hallucis

This medial foot muscle abducts and flexes the big toe, supporting the arch and propulsion in walking or sprinting. Key for preventing flat feet and plantar fasciitis. Runners target it for injury prevention and efficiency.

Foot

adductor hallucis

Inner foot muscle adducts the big toe, stabilizing the transverse arch during toe-off. Prevents hallux valgus and aids propulsion. Important for barefoot training enthusiasts.

Foot

extensor hallucis brevis

The extensor hallucis brevis is a small muscle on the top of the foot that specifically extends the big toe (hallux). It works alongside other extensors to lift the toes during walking or running, preventing toes from dragging. For fitness enthusiasts, it's key for foot stability in activities like sprinting or plyometrics.

Lower Leg

extensor hallucis longus

The extensor hallucis longus runs down the front of the lower leg and extends the big toe while also assisting in dorsiflexion of the ankle. It's crucial for clearing the foot during the swing phase of gait in runners and athletes. Strong EHL prevents foot drop and enhances explosive movements like jumping.

Lower Leg

fibularis brevis

The fibularis brevis, aka peroneus brevis, lies low on the outer lower leg and everts the foot while plantarflexing it. It's essential for lateral stability in running, surfing, or agility drills. Fitness athletes strengthen it to prevent ankle rolls.

Lower Leg

fibularis longus

The fibularis longus runs along the outer lower leg, crossing under the foot to evert and stabilize the arch. It powers push-off in sprinting and side-to-side movements. Crucial for runners to avoid ankle sprains and maintain foot alignment.

Lower Leg

fibularis tertius

The fibularis tertius is a small muscle on the front-outer lower leg that assists in dorsiflexion and eversion. It's active in quick foot lifts during running or hiking. Often absent, but when present, aids ankle agility in sports.

Foot

First lumbrical of left foot

The first lumbrical of the left foot is a small worm-like muscle that flexes the big toe's base and extends its tip, stabilizing during gait. It fine-tunes toe position for balance in yoga or barefoot training. Key for foot intrinsic strength.

Foot

First lumbrical of right foot

The first lumbrical of the right foot flexes the big toe's proximal joint and extends the distal one for precise foot control. Essential for push-off in unilateral sports like kicking. Builds foot dexterity for minimalist shoe training.

Foot

flexor accessorius

Flexor accessorius (quadratus plantae) is a flat muscle in the sole of the foot that assists flexing the lateral toes. It aligns toe flexors for even toe curl in gripping surfaces. Useful for climbers and martial artists needing foot grip.

Foot

Flexor digiti minimi brevis of left foot

This small muscle in the left foot's sole flexes the pinky toe at its base. It aids toe grip for balance on uneven terrain. Relevant for barefoot runners enhancing foot intrinsics.

Foot

Flexor digiti minimi brevis of right foot

Right foot's flexor digiti minimi brevis flexes the pinky toe base, aiding lateral stability. Supports arch in lateral movements. Train for foot resilience.

Foot

flexor digitorum brevis

Flexor digitorum brevis in the foot sole flexes the four lateral toes at their base for propulsion and balance. Critical for arch support and barefoot stability in fitness.

Lower Leg

flexor digitorum longus

The flexor digitorum longus is a powerful muscle in the deep posterior compartment of the lower leg, running from the tibia down to the toes. It flexes the four smaller toes and assists in plantarflexion at the ankle, helping with push-off during walking, running, and jumping. Strong flexors like this are crucial for balance, propulsion, and preventing foot drop in athletes.

Foot

flexor hallucis brevis

The flexor hallucis brevis is a short muscle in the sole of the foot that flexes the big toe's proximal joint. It stabilizes the arch during walking and running, crucial for propulsion and balance in barefoot training or sprinting. Weakness contributes to flat feet and poor push-off power.

Lower Leg

flexor hallucis longus

Running deep in the calf's posterior compartment, the flexor hallucis longus flexes the big toe and plantarflexes the ankle. It's essential for powerful push-off in sprinting, ballet, and hill running. Athletes rely on it for toe grip on uneven terrain.

Foot

Fourth lumbrical of left foot

The fourth lumbrical of the left foot is a small intrinsic muscle flexing the 4th toe's base and extending its middle/distal joints. It fine-tunes toe position for balance on uneven surfaces during hikes or agility drills. Helps prevent claw toes.

Foot

Fourth lumbrical of right foot

Small worm-like muscle in right foot sole, the fourth lumbrical flexes metatarsophalangeal joint and extends IP joints of 4th toe. Aids precise foot control in sports like soccer. Prevents toe curling issues.

Lower Leg

gastrocnemius

The gastrocnemius forms the visible calf bulge, crossing knee and ankle for explosive plantarflexion. Key for sprinting, jumping, and calf raises. Two heads make it powerful for athletic propulsion.

Lower Leg

plantaris

The plantaris is a thin, vestigial calf muscle aiding knee flexion and plantarflexion, like a minor gas pedal muscle. Often ruptured without issue due to redundancy. Useful for explosive calf power in jumping.

Lower Leg

soleus

Broad flat muscle deep to gastrocnemius in calf, plantarflexes ankle for standing/walking. Powers propulsion in running/squats; endurance king.

Lower Leg

tibialis posterior

Hidden deep in the calf behind the tibia, the tibialis posterior supports your arch and stabilizes the ankle. It inverts the foot and assists plantarflexion, vital for push-off in running and preventing flat feet. Weakness leads to overpronation and foot pain during activity.

Pelvis

iliococcygeus

The iliococcygeus forms the back part of the pelvic floor, spanning from pelvis to tailbone, supporting organs and pelvic stability. Important for core integrity in heavy lifts and preventing incontinence. Weakness shows in squats or postpartum.

Lower Back

iliocostalis lumborum

Iliocostalis lumborum is the lumbar erector spinae muscle along the back, from iliac crest to lower ribs, maintaining upright posture and spinal extension. Critical for deadlifts, squats, and anti-rotation core work.

Upper Back

longissimus thoracis

The longest erector spinae muscle, running parallel to the spine from sacrum to mid-back, it extends the spine and maintains upright posture. Essential for deadlifts, squats, and spinal stability in powerlifting. Weakness leads to back rounding under load.

Lower Back

lumbar rotator

Lumbar rotators (multifidus and rotatores lumborum) are deep spinal muscles that rotate and stabilize individual lumbar vertebrae. They prevent twisting injuries during rotational lifts like Russian twists. Essential for core stability in CrossFit and golf swings.

Upper Back