You use your upper body when you're running, so it's important to stretch your arms when you've finished your run. Here's how to stretch your triceps, the muscles on the back of your upper arm:
1. Bring one of your elbows across your body, towards your opposite shoulder.
2. Use your other hand to bring your elbow closer to your shoulder.
3. Hold for 15 to 30 seconds, then switch sides.
Get more running stretches.