A man dressed in a cartoonish testicle costume ran the London Marathon to raise money for cancer awareness.

Big, bright, smiling balls. (via Twitter)

Jack Woodward, a student at University of Portsmouth, ran the London Marathon on Monday looking like an upside-down pair of testes to raise money for cancer awareness and to honor a friend who passed away due to testicular cancer. The costume is actually a mascot created by the charity Male Cancer Awareness Campaign, who has been appropriately named Mr. Testicles.

It takes serious balls (sorry) to run a marathon. There is a lot of sweat, chafing, and pain in parts of your body that you didn't even know existed. Adding a giant costume to the equation seems nuts (really sorry), but Woodward did so proudly and completed the race.

Sources: Huffpo | The Portsmouth News