Voluntary muscles involved in human movement

Some of the primary muscles involved in human movement are shown here.

Main muscles of the body: sternocleidomastoid, pectorals, biceps, intercostals, rotator cuffs, abdominals, quadriceps, tibialis anterior, deltoid, triceps, latissimus dorsi, hamstrings, gastrocnemius.
FunctionExample in sport
SternocleidomastoidHelp with the breathing processAll sporting activities but particularly endurance events
DeltoidAbduction of the shoulder (moving the arm outwards and away from the body)Outward arm action in a jumping jack
Rotator cuffsA group of stabilising muscles of the shoulder which helps to prevent dislocation and allows the shoulder to rotate the humerus around its own axisA throwing action such as a javelin throw
PectoralsAdduction of the shoulder (moving the arm towards the body); Shoulder horizontal flexion (moving the arms forwards in front of the body)Upwards phase of a press up
IntercostalsAssist with the breathing processAll sporting activities but particularly endurance events
TricepsExtend the elbow (straightening the arm)Shooting in netball
BicepsFlex the elbow (bending the arm)Drawing a bow in archery
AbdominalsFlex the trunk across the stomach (sitting upwards)Performing a sit up
Latissimus dorsiShoulder adduction (moving the arm towards the body); Shoulder horizontal extensionButterfly stroke in swimming
QuadricepsExtend the knee (straightening the leg)Kicking a ball
Hamstrings Flex the knee (bending the leg)Performing a hamstring curl on a weights machine
Gastrocnemius Plantar flexion of the ankle (pointing the toes downwards)Standing on tiptoe to mark a goal shoot in netball
Tibialis anteriorDorsiflexion of the ankle (bringing the toes up towards the shin)Foot making contact with a football