Stop for pain, and train with an adult watching. 12U and up lifting: a qualified coach, spotters and technique before weight. General education, not medical advice, and no promises about velocity, speed or injury prevention. Check with a doctor first if there is a medical condition or you are coming back from an injury. Demo videos are third-party YouTube videos; the form shown is theirs. Your setup and check-offs are saved on this device only. Full guide, sources and safety: Rotational Strength Training · Arm Care Training · ArmRules · All trainings on one calendar: Training Planner.