Two of the toughest workouts ever — pure cardio and aero/tone intervals. Superbly cued by Cathe Friedrich, both programs are sure to challenge the most conditioned athlete. “Imax 2” features ten three-part circuits — an aerobic segment, an anaerobic “sprint,” and a recovery period. It's all super-intense. The aerobics are complex and innovative. The anaerobics are off-the-chart tough (a single section may include dozens of plyo-jacks and airborne “flying angels”). Even the “recovery periods” are quick-paced. The challenge continues with the “Cardio & Weights” interval workout. It features complex choreography and varied-duration aerobic intervals. Its compound conditioning segments use extra-heavy dumbbells to work multiple muscle groups (with smooth transitions that, somehow, never slow your pace). Includes some recognizable vocals like “Pina Colada,” “Build Me Up Buttercup” and “Somebody's Watching Me.” Requires at least three sets of heavy dumbbells (e.g. 5, 10 and 20 lbs.). ©2002.