Last Friday was the 600th day Paul Koepnick went into Lake Michigan. "It was never about going into the lake every single day. It was about making every single day count," he says. This is more than fun for Koepnick. It's a type of therapy called cold water immersion, similar to ice baths and cold showers."This moment of absolute power and inspiration that you have inside of yourself -- to be able to get past your limitations in all aspects of your life."To do this type of therapy, Koepnick says you need to follow the proper safety precautions and guidance."I don't advise people to go into the lake without someone who has been trained and who knows what they're doing Click here to learn more about cold water immersion. Watch the video above to learn more about this story.