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Intersperse 1-2 minute sprints in the workout to challenge yourself, keep things interesting and burn more calories. Any workout in which you use your legs is going to burn major calories because the legs are a large muscle group. {relatedarticles}Try bicycling, spinning or rock climbing to burn up to 500 calories in a half hour when performed at a high intensity. And don't overlook that rowing machine at the gym or sitting in the bedroom collecting dust. Rowing is a goldmine when it comes to calorie burn - a 145-pound woman can burn up to 300 calories in 30 minutes. Bye-bye, fun-size candy bars!