The researchers found a person was more motivated to go out in exercise if they did it with other people. Having at least one other person exercise with you met your need to socialize while meeting your need for exercise. People who exercised alone were less motivated to do it.
Interestingly you see this in golf, biking, jogging. It's more common to see 2 or more people than a single person exercising.
I do it for the endorphins.
sometimes I like to golf alone if I've been peopled out.