The biggest set of muscles in your body (relative size) are the glutes. This move hits them directly. Not only do strong glutes lead to a healthy back and flexible hamstrings, meaning less long-term problems, but the effect they have on filling a pair of jeans will lead to more attention from the hottie that hands you a towel when you walk into the gym, as well as the bikini model that works out at the same time you do. Sorry, you might have to spend money on new jeans after a while.
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