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 warmup like Olympian and marathoner Shalane Flanagan . A dynamic

warmup will raise 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! What’s your warmup routine before a run?

Read more here: 
Skip the Stretching and Try This Active Warmup