I've watched the video for bent hollow rocks over and over, and I can't tell if the athlete is doing this, but I find I have a hard time rocking back up (head coming up, feet going to floor) without a slight twitch in my legs to get momentum. Is this ok to do? Also, exactly how much are you supposed to rock? I'm doing shoulder blades of the floor to butt off the floor but was worried this might be too much of a rock. Should my rocks be slighter than that?
Also, I was wondering about the pushup progressions. I did the mastery level on incline pushups (bar set to hip height) easily enough, but found that I couldn't do the week one progression on regular pushups without my body sagging slightly at the bottom. Would it be ok to add in maybe one or two mini cycles of incline pushups, but with a bar set somewhere around knee height instead of hip height, just to work up to doing them on the floor?