The human body, in many respects can be referred to as a living machine. This implies that both the body and the implants it employs must follow the conventional laws of mechanics. While learning about the kinesiology, it is very important also to learn how various forces placed on the body cause movements. This chapter gives an overview on gravity, center of gravity, line of gravity, base of support, axes and planes, equilibrium and stability, force, motion, and levers. Therefore, in order to study kinesiology effectively and meaningfully, the basic underlying principles and concepts of the mechanics which are frequently applicable must be known. 34 well-labeled figures are also presented in this chapter, which are very helpful for the students or readers.