Step aerobics is a classic cardio workout. It’s lasted for decades for a simple reason: It delivers results. The “step” is a 4-inch to 12-inch raised platform. You step up, around, and down from the platform in different patterns to boost your heart rate and breathing, and strengthen your muscles. This class will tone your legs and booty as well as burn lots of calories. It is so much fun that you won’t feel like you are working out.