300 calories in 20 minutes!
A study earlier this year in ACE (American Council on Exercise) FitnessMatters reports that a 20 minute workout using Kettlebells can expend up to 300 calories. To put this into perspective this is twice the amount of calories burnt during a spinning or boot camp session.
The key is to utilise quick whole-body movements such as a kettlebell snatch and to maximise calorie expenditure using intervals.