Plyometric training is an intense, advanced form of exercise in which the muscles are first stretched, then contracted. That pre-stretching makes the muscle contract with greater force. Plyometric movements are powerful and high-impact, although the impact should be controlled as much as possible. Tuck jumps and "explosive" push-ups (in which you push up, take your hands off the floor, then place them down and lower back to start) are examples of plyometric exercises.
The American College of Sports Medicine says that plyometric training is both safe and worthwhile for kids and teens "if age-appropriate guidelines are followed, qualified instruction is available, and individual concerns are addressed."
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