1. Tape their nipples.
2. Get running-themed tattoos.
3. Post race reports on Facebook.
4. Cry at the end of "Prefontaine."
5. Run Yassos.
6. Run fartleks.
7. Run in these things.
8. And these.
9. Drink kale smoothies for breakfast, but finish their run with a few pints at the local pub.
10. Think running a Turkey Trot 5K on Thanksgiving morning is fun.
11. Get enraged if you call them a jogger instead of a runner.
12. Strap these things on their shoes so they can run on snow and ice.
13. Watch marathons on TV.
14. Strike bizarre poses to make their Garmin pick up a satellite signal.
15. Give directions in running mileage.
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