Four important synovial joints used in most sporting actions are the elbow and shoulder joints in the arm, and the knee and ... The shoulder and hip joints are both ball and socket joints.

1 The magnitude of forces across the elbow during tennis strokes can produce tremendous valgus and extension overload in players. The game of tennis has been described as a power game because of the ...

Flexion – bending a joint. This occurs when the angle of a joint decreases. For example, the elbow flexes when performing a biceps curl. The knee flexes in preparation for kicking a ball.