Biomechanics is defined as the systematic study of the mechanics of body joints. According to Wikipedia, 'Biomechanics is the study of the structure and function of the biological system of humans.

A lever is a rigid bar which is capable of rotating about a fixed point called the fulcrum.

Equilibrium is defined as a state of balance or a stable situation, where opposite forces cancel each other out and where no changes are occurring.

There are two types of equilibrium. Dynamic equilibrium and static equilibrium.