High Intensity Interval Training — three ultra-tough, no-nonsense workouts. You'll burn fat with flat-out, super-challenging cardio “blasts,” then barely catch your breath in the follow-up “rest” segments. But don't be fooled — this entire workout is intense (even Cathe struggles to breathe and talk at the same time). Each program challenges your body with a different blast/rest format: 30/30, 40/20 or rotating “pyramids.” 30/30 has 30 seconds of blasts followed by 30 seconds of rest. 40/20 is 40 seconds of cardio and 20 seconds of blasts. The pyramids program increases, then decreases, the blast/rest intervals. All the moves are pure athletic drills, not “choreographed sequences.” They range from power scissors and plyo-jacks to “power squat lunges” and “three jumps forward with a jump turn.” The first two workouts mix on and off-step aerobics, so they requires a classic step bench. ©2009.