This is a popular tensioner for arm strength training a long time ago. There are five long springs in total. They are used for pulling with both hands. You can increase or decrease from one to five springs according to your own needs. I can't pull it off🤣 Usually I have nothing to do with my left and right hands and pull it a few times, sometimes I step on the soles of my feet and pull with one hand, anyway, that's how the fitness equipment works 😂😂😂 # 百万积分第六季 #