Problem: Kids can be injured using trampolines. Injuries usually occur when two or more kids jump on the trampoline at the same time. 60-70% of trampoline injuries happen when more than one child is on the trampoline. One study found that the younger and smaller of the two kids was 14 times more likely than the bigger kid to be injured. This is due to the greater force from the heavier kid, which tends to bounce the lighter child up and off the trampoline.
Solution: Due to thousands of head injuries and fractures caused by trampolines every year, the best solution is to not use them. However if a trampoline is to be used, only one person at a time should be on it. Also an adult should supervise anytime a child uses a trampoline.