This guy's friend Sky made the claim that he could run a marathon in under five hours without training. So, he decided to put his money where his mouth is, and give it a shot.

Claiming that his strength is flag football, Sky does not declare himself to be a great runner. Taking part in the Richmond Marathon, Sky shows incredible determination and perseverance. Obviously at least somewhat naturally athletic, Sky is in decent shape for a normal person, but the toll of running a marathon quickly manifests in visible sluggishness. Pounding back waters, hydration and nipple chafing seem to be two of his biggest obstacles. Ultimately, Sky makes good on his promise by just one minute, and wraps up the full 26.2 miles in 4 hours and 59 minutes. What a legend.

He even has enough energy to grab a drink after. That's how you back up your word.