The New Method 20/20: Precision Abs (2002)

Perfect for busy fitness buffs, this workout video - led by exercise mavens Jennifer Kries and Lisa Wheeler - includes a pair of 20-minute routines that combine movements from yoga, dance, Pilates and traditional cardio drills. Set to a lively beat, the regimens are designed to chisel those troublesome abdominal muscles in no time flat while also toning and strengthening your core and your lower back.