If you’re exercising to lose weight, less is more. That’s the gist of research in the . In a study, a group of overweight people were given the choice of exercising either 30 or 60 minutes a day. The catch? Those who chose less exercise had to do a slightly more intense workout, three days a week. So, what happened? After three months, the people who exercised an hour a day lost an average of 6 lbs. But get this: Those who exercised only 30 minutes lost an average of 8 lbs.