Learning from the Martial Arts: The Art of Effortless Power

Coach Jim McLennan identifies how the martial arts disciplines offer tennis players a conceptual framework to help develop "effortless power" on court. 

"Five fundamental principles in the martial arts - and to my mind they are outstanding and totally applicable to tennis - [are]: 
1. Relaxation
2. Feeling the whole body
3. Moving from the Center
4. Being grounded
5. Calmness" 

---Coach Jim McLennan, Website: EssentialTennisInstruction.com 

For more reading: Zen Body-Being: An Enlightened Approach to Physical Skill, Grace and Power, Peter Ralston, (Frog Books: 2006), 200 Pages.