Stretching before a run has always been a little iffy in our playbook. It's hard to lengthen muscle fibers before they're warm, and trying to do so can lead to injury. But warming up is still a good thing, so try an active warm-up.
A dynamic warm-up raises your heart rate a bit while priming your joints for action. We created this video of five moves to do before you hit the ground running. Check it out!