An exercise you would do in a gym. Basically consits of two parallel bars raised to some height. You are to stand between the bars and raise/lower yourself using only your hands. It works your triceps and latissimus dorsi as well as a bit of your shoulders.

Note that sometimes there are assisted dips. Basically there's a counter weighted leg rest which allows you to control how much weight you're going to be lifting. If you want to work on your tricepts I suggest this.

There are a couple of drawbacks:
  1. Your wrists WILL hurt if not done properly (and quite possible even if done properly)
  2. Your shoulders will also hurt the first few times you do it


Just like with everything you do, consult your doctor if you're unsure or experiencing weird pain. Good luck.