“Working out releases endorphins, your body’s natural happy drug that washes your mind with a sense of self-accomplishment and contentment,” says fitness expert Chris Freytag. “Plus, every time you work out, you gain personal triumph over laziness and procrastination, which makes you feel proud. Often, when you like yourself better, you like how you look, too.” MORE:Here’s Everything You Need To Know About Being Happier Researchers also hypothesize that the self-confidence boon could be from the fact working out can help you gain lean muscle mass and lose or maintain weight. This could motivate people to exercise more, continuing the feel-better-look-better cycle. Even if you don’t have time in your busy schedule to work out every single day, don’t sweat it—your self-confidence will get a little boost for every extra day you exercise during the week. Go ahead, check yourself out. MORE: 25 Easy Ways To Fit In 10 Minutes Of Exercise