Demons drill put over the weekend worked very well.
I worked on pretty much all of them,but the duct tape underbars worked the best.
http://www.americanparkour.com/content/view/49/245/

After i tried them for awhile we went out and did underbars we couldnt do before at all.
Who ever wants to get better at underbars id advise you to try that drill
