Nicole Cooper has a site called Gymnastics the Great:
For All The: Gymnastics, Gymnast, Coaches, Judges, Gyms, Skills, Drills, Handstands, Cartwheels, Splits, Leaps, Flips, Rolls, Jumps, Twists, Falls, Breaks, Bruises, Lessons, and Beauty
Browsing the archives there are a number of posts on injury prevention and the benefits of gymnastics.
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Gymnastics Coaching.com 