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Five 10 to 13-minute segments, they each use a different ab-tightening technique. To maximize variety — and to fit your busy schedule — the DVD lets you play the segments in any order. The standing section works your abs as it warms you up for the following exercises. The core series uses planks and stabilization moves to engage your deepest muscle layers. The bootcamp portion features gym-style crunches and V-sit drills. Then it's a stability ball segment that combines balance and core exercises. Finally, you'll focus on your core with a well-structured Pilates matwork sequence. Kathy's cuing is precise, calm and always friendly. Requires a stability ball. ©2007, remastered in 2013.