They use all kinds of things from a backpack with a softball inside to a ball in a sock on the back to a shark fin type thing to alarms that ring when you roll on your back.

这种疗法会用到各种东西，从装有软球的背包，到在背上挂一只装有球的袜子，再到能在你仰卧时响起警铃的鲨鱼鳍状物。