Ok, hm....well the only thing I can think of is pull you underwear really far up your butt, take one end of a piece of rope, and throw it over a really high branch. Then, put the other end and tie it to your leg holes. Now either you or a friend pull the end of the rope over the branch as high as possible, then tie the rope to something really tight. If you want to be really high up off the ground, have a friend do the pulling.
