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Attack body fat with three, ten minute workouts designed to flatten the abs, tone the thighs, and tighten up that bottom in time for bikini season. A perfect workout for viewers of all ages and fitness levels, Crunch offers a noncompetitive, nonjudgmental approach to exercise that is as effective for the beginner as it is for those just seeking to stay in shape. AAFA certified instructor and personal trainer Lena Pereira has been shaping up the residents of South Beach for over seven years, and now people across the country can benefit from her years of knowledge and experience as well.