Torching calories and building lean muscles doesn't need to take all day. Give us half an hour, and we will help you burn up to 300 calories. This 30-minute workout keeps you moving, mixing cardio moves with weight lifting to maximize your metabolism. To burn those 300 calories, you're going to have to push yourself. But we know you're up for the challenge! Grab your dumbbells, between five and 10 pounds; press play; and get ready to burn it up.