Hi. I don't know if this is helpful, but here is a link to some guy doing pullthroughs. Pretty much how I do them, except I go slower. Just get into position to where you feel your hamstrings really well. I find holding the rope in a "handshake" position is more comfortable than thumbs up. Start out with a easier weight to learn the form and what to feel for. I think I only use about 60 pounds as my working weight, too much and it's hard to anchor yourself.

http://www.youtube.com/watch?v=VuDc...=related&search=