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The third edition of the hit DVD exercise series P90X is both more manageable time-wise and more reasonable physically.

P90X-ers embark on a rigorous regimen packed with push-ups, pull-ups, squats, leaps, sit-ups and pumps. Every day brings a different routine, so there’s no time to get bored.

The P90X workout program is rough, especially the yoga part. But if Rep. Paul Ryan can keep up with it while campaigning as Mitt Romney's vice presidential pick, it gives some incentive.

Behind the promotional smoke and mirrors is an effective, well-designed regimen of home-based exercise built on sound physiological principles. One month in and already I'm noticing real differences.

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