Cathe Friedrich's Core Max DVD

Three very targeted, very different workouts — classic floorwork, stability ball abwork and stability ball/medicine ball abwork. It's a combination that maximizes motivation while challenging your muscles in diverse ways (e.g. alternating segments in a three-day rotation). You'll work the entire abdominal area from every angle, always carefully sequencing the routines to maximize effectiveness (e.g. isolating the lower abs first, then adding on multiple-muscle exercises). Cathe's no-nonsense cuing is clear and precise. Requires a stability ball; Cathe uses an 8-lb. medicine ball, but a dumbbell also works (just not as comfortable). DVD's “premix” feature lets you select three other workout variations. ©2005.

Core Max features three intense twenty-minute abdominal and lower back segments. Each segment has a unique flow of effective core exercises. Segment one is simply performed on a mat, while segment two incorporates a stability ball, and segment three incorporates a stability ball and an eight-pound medicine ball. Feel free to pick and choose anyone of the segments and do them three times per week. Keep your focus, use good form, and execute every rep to your maximal effort.

DVD has chapters and premixed alternate workouts.