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

You can't spot reduce arm fat, but arm exercises can tighten and tone the upper body. Tone the arms and build muscle with ...

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.

The human body has three main classifications ... The knee joint that allows the knee to bend and extend The elbow joint that allows the elbow to bend and extend The finger and toe joints that ...