Many happy couples exercise together, whether it's a post-workout walk or a trip to the gym. According to relationship specialist and professional psychotherapist David Bennett, "studies demonstrate that regular physical activity may make you happier." Married couples also tend to spend time together out of work hours — usually with their families — but they don't always get the chance to just veg out together. Sometimes they have activities planned with their friends, other times they just relax at home. In fact, married people are more likely than others in relationships to go out with their friends after work, according to a study from Indiana University. The study found that married people are 1.5 times more likely than those in other types of relationships to go out with their friends. They're also more likely to go to concerts, eat out, or do other activities with their friends. So if you're married, be sure to add some fun things to your schedule every now and then. You'll feel better about yourself and your marriage too!