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We've all been there! Whether you overdid it at a barbecue, had a little too much cake at a friend's birthday party, or decided to bake a batch of brownies and accidentally ate half the pan (oops!), if you're feeling bad about indulging, a good workout to burn off those extra calories can make you feel better. Earlier this week, Britney Spears got more bang for her buck by not only walking on an incline to tone her legs and butt and get her heart rate pumping, but she was simultaneously doing overhead shoulder presses [2] to work her upper body. Simple, yet effective!