At a gym in Boston, there's a waitlist for a $30 class that fits in 120 squats in 45 minutes. The class, Booty by Brabants, was started by Kelly Brabants a year ago. Brabants starts most classes, held at The Club by George Foreman III gym, with Lopez's "Booty" song. By the end of the year, she plans to expand her brand by selling $65 workout leggings that help perk up the butt.
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