Fitness squares are one after another. What kind of fitness equipment is that?
The correct way to use the fitness equipment ladder is to start from one end, grab the ladder with both hands and hang the body vertically. Go ahead one by one, and then go back.
Another way is to hold the ladder by hand and do as many pull-ups as possible. You should do what you can, and never try to be brave. In order to avoid injury, these are all exercises to train arm strength, develop arm muscles and increase strength.