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These substances impair a person’s reaction time, judgment, and physical coordination. Encountering Objects: Use of a trampoline while other people, pets, or objects are underneath it will increase the chance of injury . Jumping while holding or having an object on the trampoline, particularly one that is sharp or breakable, will increase the chance of injury. Placing a trampoline too dose to overhead electrical wires, tree limbs, or other obstructions can increase the chance of injury. Poor M