Internal Discipline in Classical Small Circle Tai Chi is an ancient movement science. Its principle and practice are hidden in the heart of modern sports today. The detailed video analyses below show that the top athletes in these sports FOOTBALL, TENNIS, SOCCER, BASEBALL, & BOXING, all use the techniques taught in Classical Tai Chi to generate their power in their key movements. They acquired these capabilities through their own discovery and training which enabled them to excel. Classical Tai Chi provides a systematic way to train people to acquire the fundamentals of this capability.