11 Fitness Challenges That Will Destroy You

These challenges come straight from elite strength and conditioning experts who work with some of the fittest people on the planet. Are you up to the challenge?

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100-Yard Power Wheel Challenge

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Ryan Hoover:Â In my opinion, one of the simplest but toughest exercises is the 100-Yard Power Wheel Challenge, which we regularly use at Fit to Fight.Â The University of California at Berkeley did a study that deemed the Power Wheel "the most effective core trainer."Â My clients and students think it's evil.

How To:Â Assume a Push-Up position with your feet on a power wheel.

Crawl for 100 yards.

Ryan Hoover: In my opinion, one of the simplest but toughest exercises is the 100-Yard Power Wheel Challenge, which we regularly use at Fit to Fight. The University of California at Berkeley did a study that deemed the Power Wheel "the most effective core trainer." My clients and students think it's evil.

How To: Assume a Push-Up position with your feet on a power wheel.

Crawl for 100 yards.

Rest as needed, but know your result will be timed.

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