I'm a bit confused. I just received the DVD and did this exercise and liked it but Trunk's description sounds a bit different than what I did. Are you modifying it Trunk? I assumed the position above and raised my hips and held them there until there was some slight shaking (or more like pelvic rocking. Then I lowered the hips, relaxed for awhile letting my knees just hang there and then began gradually raising them, stopping every 2"'s or so to feel the tremors. Is it when your knees are finally raised to the top when you put them together and gently rock them back and forth, Trunk? I'm happy with the DVD but I'm just wondering if there is a variation that I'm missing. Thanks much.