## TL;DR
Sports biomechanics applies physics and engineering principles to human movement — optimizing technique, preventing injury, and designing equipment.

## Core Explanation
Kinematics (describing motion): displacement, velocity, acceleration. Kinetics (forces causing motion): Newton's laws, torque, angular momentum. The stretch-shortening cycle (muscle-tendon unit) stores elastic energy during eccentric contraction for explosive concentric release.

## Detailed Analysis
Motion capture (optical markers, IMU sensors) generates 3D kinematic data. Inverse dynamics calculates joint forces from motion data. Fluid dynamics explains swimming propulsion and aerodynamic drag in cycling (drafting reduces energy expenditure by 15-30%).

## Further Reading
- International Society of Biomechanics in Sports
- Journal of Applied Biomechanics
- Dartfish Video Analysis