Primal Pro Xr nsanity isn't for the week minded. Former track runner and dancer Shaun T tests the limits of how far you can push yourself in every workout. And every workout leaves a new muscle part sore. Insanity carries strong warnings to check with your doctor before beginning. But if you get the okay, you will get in the best shape of your life. After several weeks I've noticed increased quadricep and calf strength. And I look forward (while dreading) every workout. It has challenged me more than any other workout has.
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