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This article discusses the three different energy systems your muscles use to fuel exercise along with the types of exercise to target each. Exposing your muscles to progressive overload through weight training is the stimulus that causes them to grow, but there are a number of “key players” behind the scenes that influence how much return you get on your weight training investment These anabolic and catabolic hormones can make it easier or harder to build lean body mass Here are some of those hormonal players and what they.
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