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These muscles actually play an essential role in optimizing the strength of the legs, stabilize the pelvis, and support the spine.

Shape and Tone Your Butt in Just 3 Weeks

Feeling like you need a lift? Get your booty in to gear with this 21-day challenge that is sure to give you a better behind for those summer bikinis.

Here’s your daily squat schedule: | Take BuzzFeed's 27-Day Squat Challenge, Have The Best Summer Of Your Life

Take This 27-Day Summer Butt And Thighs Challenge