The 5-Minute Isometric Challenge | Men's Health: "Sure, the fittest survive...and they also get noticed. Resisting fatigue helps you outlast the competition, so when the dust settles you're the last man standing. Gauge your stamina with this isometric circuit, which requires you to hold the toughest point of three classic moves. Done weekly, it can also help boost the activity of the energy-producing structures in each muscle fiber, says David Jack, the owner of ActivPrayer in Phoenix, Arizona, and trainer in The Spartacus Workout DVD. The result: more power to not only move more iron but also crank out rep after rep"
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