Re: P90X cycle, and then...
Legs and Back DVD: lots of squats and lunges of all different varieties, a few with the 25lb dumbbells. For every leg exercise there was a pull-up routine afterwards. The DVD finished with 11 different ab workouts w/ 25 reps a piece. I finished most of the leg back stuff and saw improvement in ab endurance, I think this is the third time Iíve done the ab exercises.