Sometimes, it feels great to spend a weekend on the couch, watching TV and playing video games. The only problem is that later you might feel guilty for having been lazy. Studies show that relaxing and doing nothing could be a smart move. In fact, being lazy could help you live a longer life. In a new study, scientists looked at the bones of over 300 animal species. They learned that the species that burn off calories faster usually die out quicker. Meanwhile, lazy species that use less energy have a better chance of survival.