"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." THE BACK extension, that time-tested move for building back strength, has been around the block. But here ...
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How to Use Butt Workout Machines at the Gym
Your gluteus maximus is the muscle that defines the shape of your backside and helps you powerfully straighten your leg at the hip. It tends to get most of the attention when people look to build the ...
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