Cathe Friedrich's X10

Five short-but-tough programs that each feature a different fitness technique. Now it's easy to get a challenging workout on even your busiest days. The first three programs have a similar format — they all begin with pure aerobics and end with pure toning. But the cardio is different — step in the first, low-impact in the second and very high-impact in the third. The toning in all three workouts emphasizes time-efficient, multi-muscle exercises (e.g. upper-body overhead presses while doing lower-body lunges). The fourth program is super-intense cardio — plyo-jacks and just plain "jump as high as you can" moves. The final workout is classic aero/tone intervals. Note: The warm-ups and cooldowns are repeated in every program. Requires 5 to 10 lb. dumbbells; gliding discs are used in one series. ©2013.