Turns out a 30 minute workout is all it takes to get you in better shape, at least that's what a new Danish study is claiming. The study involved observing 60 "moderately overweight" men who either biked, rowed or jogged for either 30 or 60 minutes.

About 3 months later, the results showed that the men who exercised for 30 minutes lost an average eight pounds, while the 60-minute men lost only six pounds on average.

According to the researchers, those who worked out for 60 minutes were more likely to have bigger appetites, which could have led them to eating more thus canceling out all the extra work. Another theory is that the longer workout left participants more exhausted, diminishing their activity levels for the rest of the day.