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Energy Boosters

A solid workout depends greatly on your energy reserves that particular day. Some days you have it, and some days you don't. But with a little help from energy boosters, even your most sluggish days can morph into a surprisingly intense workout. These preworkout formulas often contain such energy- and endurance-boosting compounds as caffeine, yohimbe bark extract, guarana, ginseng, choline, ginkgo biloba and B vitamins to help put that much-needed pep into your pump. <<

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