I had the same experience in FL-I, so I added leg curl. Since I did SHELC throughout FL-I, I'm now doing single-leg SHELC in FL-II. Don't know if that's the best approach, but it worked for me.
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Subliminal MOTD: "If you insist on using a thumbless grip on the bench, you need to do it at home, so that when the ambulance comes (if anyone is there to call 911) it doesn't disrupt anyone else's training" - Mark Rippetoe
My NROL training log: The Eternal Beginner
I found these sort of tricky when I started out (not during FLI, during another program) and also thought that they weren't necessary and didn't feel anything. Is this a new movement for you? I know when I first did it, I had trouble using my glutes as the prime mover for the movement and the 1 second hold at the top, let alone 'feeling' the hamstrings and lower back at all.
One thing I noticed (and also had my workout buddy do the same) is to make sure only your heels are on top of the ball...anything else lends too much support (ie - the backs of your calves). When you initiate the movement, your heels will push down into the ball, but your glutes should be the only thing to get your body in a line and hold you there for a second.
Hope that helps.
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someone else may find a better video but here are a couple of video demos. I don't recall if NROL calls for straight leg or bent leg, so here's one of each. You also see a difference of "heels on ball" vs. "flat foot on ball"
this is the bent leg version
supine hip ext
Linear Mode
