Excerpts — Conditioning Young Athletes
It is appropriate to moderately increase the intensity of training during the athletic formation stage of development. Although most athletes are still vulnerable to injuries, their bodies and capacities are rapidly developing.
Speed development increases during puberty. Most children - both boys and girls - experience an acceleration in speed development during this stage. Such improvement may relate to increases in body and muscle size.
Forward Crossover. Focus: quick leg action, agility. Moving left, the right leg crosses in front of the left leg for 10 meters or yards in each direction. Repeat.