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Below are the top 10 cardio exercises which 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 approximately 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 approximately 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 approximately 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