Kelly Herron was on a run training for a marathon, when she decided to take a break to pee.
She was followed in the bathroom by a registered sex offender who attacked her.
Kelly had taken a self-defense class at work a few weeks earlier.
Kelly knew just what to do, she fought for her life while screaming, "Not today, motherfucker!"
Her fitness tracker captured it all. Proof that she put up a HELL OF A FIGHT!