Formosa Fitness

http://www.acefitness.org/getfit/studies/Kettlebells012010.pdf

This is some research conducted by ACE on kettlebell training. Specifically, they looked at the :15/:15 snatch protocol that I've been doing for fitness. They found that on average, participants were burning 272 cals. in 20 minutes.

During the 20-minute workout, the average calorie burn was 272 calories, not counting additional calorie burn due to the substantial anaerobic effort. “We estimated oxygen consumption and how many calories they were burning aerobically, and it was 13.6 calories per minute. But we also measured the blood lactate, so anaerobically they were burning another 6.6 calories per minute,” explains Porcari. “So they were burning at least 20.2 calories per minute, which is off the charts. That’s equivalent to running a 6-minute mile pace. The only other thing I could find that burns that many calories is crosscountry skiing up hill at a fast pace.”
Researchers credit the brisk calorie burning to the fact that the kettlebell snatch workout is a total-body movement that is also done
very quickly due to the interval-training format. “We knew it would be extremely intense,” says Schnettler. “It’s a quick workout, and
you do get a big bang for your buck in a very short amount of time.”

This is great news for kettlebell lifters and shows what many of us knew all along. Kettlebell training offers results through the combo of strength and endurnace training that other training can't touch. 

I also personally experienced the fat loss through this exact interval training as documented here on the blog.

But notice that the results came through intense training. So grab a kettlebell and ramp up the intensity. :)