One-Hour Workout: Your New Favorite Fartlek Run

This week’s fartlek run workout comes from pro triathlete and Endurance Corner coach Justin Daerr. The Boulder, Colo.-based coach says you can do the workout once through, or do it as a pyramid and work your way back down. “The first way is more of a ‘feel good’ session, the second way is a bit more challenging,” he says. The recovery time is equal to the hard effort.