Ryan Reynolds and Rob McElhenney want to bring awareness to colon cancer, the second biggest cancer killer in America. The best way to prevent colon cancer is by getting a colonoscopy when you turn 45, so the 45-year-old actors partnered with Lead From Behind and went candid as ever, filming their first colonoscopy. Ryan Reynolds In a less than the 7-minute video posted on his YouTube page, Reynolds’ colonoscopy experience was documented. “I would never normally have any medical procedure put on camera and then shared,” he said. Colon cancer is predicted to be the top cancer killer for . . .