Valentin Uzunov posted an article on The Gym Press:
… a 12 week off-season sprint training program, for preadolescent gymnasts (7-12 years of age), who have not had formal sprint training. A detailed discussion is presented on the theoretical and practical application of the key concepts to effective sprinting for vault: optimized running mechanics, start of run-up and acceleration. The methodology behind this program is based on current track and field coaching methods, scientific literature on sprinting biomechanics and preadolescence speed and strength training principles. …
read the full abstract
It’s available to download for a few dollars. (This is a great way to support Valentin’s work studying the art and science of gymnastics coaching.)
He’s posted a number of videos on TheGymPress channel supporting this article.
One sample is a drill that I use a lot – Partner hamstring curls. Click PLAY or watch it on YouTube.
Gymnasts often have a muscular imbalance: their quads are too strong relative to the hamstrings. Partner hamstring curls are ideal for getting close to a maximum contraction safely.
Gymnastics Coaching.com 