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30-Day Squat Challenge: One Month to a Better Butt If it's the year of the booty (thanks, Iggy and J.Lo), summer is its climax. That's why, for the month of July, we've put together the ultimate 30-day squat challenge, featuring 12 squats that tighten and tone. Master a different squat or increase your reps each day, and we'll have you covered where your teeny bikini doesn't.

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