It's true: everything is better with a buddy.
Learn why it's important to find a wingman when tackling your toughest workouts.
Have you thanked your Mule today?
It helps to have other runners there to push you.
I swear, if I ever get around to growing up, I want to be exactly like them.
3. Please limit yourself to no more than two electronic devices when you work out.
Shalane Flanagan now has a female training partner.