Now let's take a look at Michaels' weight-loss claims using the example of a middle-aged woman who weighs 190 pounds. Since there are 3,500 calories in a pound of fat, to fulfill Michaels' promise of losing 5 pounds a week, this woman needs a weekly deficit of 17,500 calories.
Part of this massive caloric deficit can result from dietary restriction — but not too much or it could cause her metabolism to slow down and she would experience intense hunger. A minimum intake for our hypothetical woman is around 1,400 calories a day, which is about 500 less than her typical weight-maintenance diet. Over the course of a week, she could lose 1 pound this way. So just 4 pounds — or 14,000 calories — left to account for.
Kettle bells can be a tremendous calorie-burner in the hands of an experienced user. But since Michaels' DVD is targeted at overweight and out-of-shape women, I think a generous estimation of how many calories our hypothetical woman can burn is about 600 an hour. Considering that she would burn roughly 100 calories sitting on the couch, the actual extra calories burned from doing Michaels' workout is 500 per hour.
Dividing that into the remaining weekly deficit of 14,000 calories, we find that our poor woman needs to use Michaels' kettle bell DVD for 28 hours each week. That's four hours of kettle bells a day — every single day.
Two fitness experts who are experts and certified in kettle ball training called Michael's kettle ball technique appalling. Yikes.