Many people say they don’t work out because they simply don’t have the time. If you’re one of them, your favorite excuse may have just fallen by the wayside — a new study shows just 30 minutes of daily activity is enough for weight loss.

The trick is to exercise hard enough to break a sweat. Do that, and you’ll get better results in 30 minutes than many people get in an hour of more moderate exercise.

Researcher Mads Rosenkilde, a PhD student at the University of Copenhagen, says the study results were surprising, but could have something to do with shorter workouts leaving participants energized rather than exhausted — which makes them more willing to exercise again the next day.

In addition, people who who did 60-minute workouts probably ate more to compensate for the extra time they spent at the gym, thus negating a lot of the work they did and slowing their weight loss.

[WebMD]