According to a recent study, working out with a buddy could increase the effectiveness of your workout, but with that said—not all workout buddies are created equal. The study found that choosing a partner who you perceive to be a better performer than you could increase your workout time and intensity by as much as 200%.
The study was done by Brandon Irwin, a Michigan State University researcher, who found that feeling inadequate may be a potential key to motivation in exercise. "People like to exercise with others and make it a social activity," Irwin said. "We found that when you're performing with someone who you perceive as a little better than you, you tend to give more effort than you normally would [when exercising] alone."