You don't need it, my friend. What a waste of money. If you are just afraid of getting hurt and want to find someone to practice with you, ask a friend who works out with you for help. If you don't know the training methods and precautions of those instruments, I recommend you to search on Youku, which is full of short and incisive tutorials to teach you how to use instruments. When practicing, you must be standard. There is a mirror on the wall of the gym to see for yourself. Grasp the intensity by yourself and step by step.