get a stability ball and balance on your knees. There are also a lot of core exercises you can do on them. Other than that, don't neglect wrist/grip strength and neck work outs, and if you have room I'd recommend breakfall/shrimping drills
It looks ridiculous and I don't see the benefit of it over training regularly.
damn howd that guy make that grappling doll??
id def do it!
i wish i had to drill all day whats learned in class
He said he used some type of wire, old clothes and duct tape
One of my training partners made his own as well. Pretty impressive, really.