Major muscle groups

deltoid

lifts arm straight out to the side and up- abduction at the soldier joint e.g block in volleyball

trapezius

causes extension at the neck e.g Rugby forward in a scrum uses it to bind into the opponents

latissimus dorsi

broad back muscle- causes adduction at shoulder joint, swings arm backwards and rotates it inwards e.g swinging arm bak in serve table tennis

pectorals

2 sets of chest muscles-causes adduction and flexion at shoulder joint in horizontal plane, help adduct arm and rotate it inwards and lowering the shoulder blades e.g rugby player making tackle

biceps

causes flexion at the elbow-swings upper arm forwards and turns forearm so palm of hand points upwards e.g bicep curl weight training

triceps

causes extension at the elbow- straightens elbow and swings arm backwards e.g backhand table tennis

abdominals

bends body forwards at hips causing flexion of vertebral column and helps turn upper body e.g sit ups

quadriceps

provides stability to the knee joint and extends or straightens it e.g long jumper when driving off the board will straighten knee joint at takeoff

hamstrings

straighten hip and cause flexion at the knee joint-bends knee and rotates it outwards e.g netball player bends knees for running