Here are some great book to read about coaching, drills, and skill development in Sports/Physical activities:
- Judo Training Methods by Takahiko Ishikawa
- Coaching Wrestling Successfully by Dan Gable
- Successful Coaching by Rainer Martens
- Coaching: A Realistic Perspective by Ralph Clark
- Positive Coaching: Building Character & Self Esteem through Sports
- Motor Learning by Richard Magill