 There was even a podcast and several documentaries made to figure out why this very public and positive person went quiet. Simmons said he was dealing with knee problems and wanted to spend some time alone. He said his life's mission was to make people laugh and help people. And the formula he used was simple. Have a positive attitude, control your food portions, and move every single day for at least 30 minutes. For NPR News, I'm Kyle Norris. One, two, three.