The American Council of Exercise recently released a study that concluded that kettlebells provide a much higher-intensity workout than standard weight-training routines and offer superior results in a short amount of time.
When I started working out with trainers I was introduced to kettlebells and TRX. My workouts with kettlebells always leave me breathless and a shaking in my behind from all the squats. I think what I like best is that you run through all the workouts once and get the same results as breaking them into segments.
According to the study, you can burn approximately 20 calories per minute during a typical kettlebell workout, and 400 calories for a 20 minute workout. In terms of calorie burning, these results are equivalent to running a six-minute mile pace, or cross-country skiing uphill at a fast pace.
The Tone It Up Girls have a great workout that you can print and take with you on your next venture to the gym.