Did the Core Synergystics last night and got my ass handed to me. I held my own, but couldn't finish the video. The alternating push ups to pop-up and back down asre what put me over the edge. I got to 25 reps and pretty much ran outa gas. raging dizziness and fatigue. ugh. Going to do arms and shoulders tonight. Felling SOOO much stronger now and have come down two belt holes. WOO WOO!!