Friends, what kind of device is this? This device simulates a table. It also simulates a one-on-one fight. If you look at the handle, where you should hold on with your hand, it is screwed in. That is, it is as if you are really grabbing a real hand and closing your hand. Plus, you are stretching and pressing to the side. That is, this device simulates a real fight. You can just add weight there.