I think Cathe's toughest ab workouts are from ME, SJP, KPC, and BC. I try to do ME and SJP often during the week because they seem to have the most effect for me. KPC - I hate doing the pikes on the ball! I am so afraid I am going to crash everywhere! I haven't tried doing the BC abs too much separately, though I may have to start. Good suggestions. I think the bike maneuvers are the worst, yet I have read those work the abs the most effectively (at least that is what I keep telling myself as I struggle to finish them!).:7