With any cardio exercise, 150 minutes a week is a great baseline, so you can break that up however you want. Dancing for about 30 minutes a day, five days a week, is optimal. It's also a good idea to ...

Short on time? Try one of these super quick cardio circuits at home. They'll rev your heart rate and help you break a sweat in no time. Demo-d by celebrity trainer Lacey Stone.

A natural assumption is that circuit training is a cardio exercise since it elicits a significant heart-rate response. People often relate heart rate to cardio, or aerobic exercise.

6. High-intensity interval training High-intensity interval training is a method of circuit exercising that involves strength training or short bursts of intense cardio and periods of rest.