Top 10 cardio exercises that burn the most calories in 30 minutes.

1. Step Aerobics - One of the most favorite cardio exercises preferred by women. Step Aerobics mainly target your legs, hips and glutes, and can burn approx. 400 calories in 30 minutes. 

2. Bicycling - Stationary or outdoors is a great cardio exercises, depending on resistance and speed can but 250 to 500 calories in 30 minutes. 

3. Swimming - Like cross-country skiing is an excellent cardio exercises as it is a full body exercises. Swimming is a great cross-training for other cardio activities. Doing the breast stroke can burn approx. 400 calories in 30 minutes. 

4. Racquetball - Side to side sprinting makes racquetball and excellent cardio exercises. A 145-lb person burns over 400 calories in 30 minutes. 

5. Rock Climbing - Is not only a cardio exercises, but also uses arm and leg strength and power. Rock Climbing can burn up to 380 calories in 30 minutes. 

6. Cross-Country Skiing - Whether on a machine or outdoors on snow, is an incredible cardio exercises as it involves both upper and lower body. A 145 lb person can burn approx 330 calories in 30 minutes. 

7. Running - Running is an excellent cardio exercises because all you need is a pair of quality running shoes. Running burns serious calories. A 145 LB person can easily burn 300 calories in 30 minutes. 

8. Elliptical Trainer - Is an excellent cardio exercises and a great way to build endurance. A 145 LB person can burn about 300 calories in 30 minutes. 

9. Rowing - Is both a cardio exercises as well as giving your arms an incredible workout. 145 LB person can burn about 300 calories in 30 minutes. 

10. Walking - Brisk walking is a less strenuous form of cardio exercises. Walking can burn up to 180 calories in 30 minutes. Sprinting, adding hills or an incline can increase amount of calories burned.