If you're already fit, it can be a challenge to find workouts that are challenging enough to help you improve your fitness level even more. We went in search of some of the toughest workouts around to help the fit get fitter! (Warning: We recommend bringing along water, a towel, and possibly a friend to revive you before attempting any of these high-intensity training methods).
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If the name doesn’t tip you off, perhaps Shaun T’s abs will. Insanity is another extreme home workout program (created by the same company that produces P90X) led by celeb trainer Shaun Thompson that focuses on bodyweight only interval training to build strength, power, and of course, killer abs. This 60-day program also comes complete with a nutritional plan (After all, abs are made in the kitchen) and 10 DVD workouts. Get ready to go insane—and get amazing results!
For more info: Insanity.com