The Donkey Calf Raise <----- is super functional and hillarious. I dont understand why I dont see more people doing this. As a personal trainer I would actually suggest to people to not do this, for the obvious risks of the load on your back and the risk of one or both parties (or all three) getting injured. As you can see the picture from Ahnold and his buddies, it will get you very strong, but again, just dont do this exercise, unless you want to and fine, who am I to stop you.