1. Biology: This provides the foundation for understanding the structure and function of living organisms, specifically the human body. It encompasses areas like anatomy, physiology, and kinesiology.

2. Mechanics: This focuses on the study of forces and their effects on objects. It includes principles from physics, such as motion, equilibrium, and energy.

Biomechanics effectively bridges these two fields by applying the laws of mechanics to the movement of biological systems. It aims to analyze the forces that act on the body during movement and the effects these forces have on the tissues and joints.