I have been doing these lately, and can't feel anything what so ever in my hamstrings. Are these similar to lat pull downs where you just have to learn/get used to them until they work? I know for the longest time lat pull downs only made my arms tired until one day I started to feel it in the lats. I usually keep my back arched, legs barely bent, and bent at the waist until I feel a good stretch in my hamstrings, then go back up. Is this how you are suposed to do them? Thanks for the help.