I guess when you're a retired Olympic athlete, you need to fill your time with something right?
Michael Phelps is the most decorated Olympic athlete of all time, with 28 medals in total. He's also a new dad to son Boomer, and recent retiree.
Phelps made the decision to retire after considering his future.
“The hardest thing is going to be not having the chance to represent my country. Not having the chance to stand on the medal platform and hear the national anthem," he says. “I’m at peace with how things ended. I’d rather have a healthy body in 20 years than kill myself more now. To me, it’s a no-brainer.”
What other people may consider a no-brainer is also...NOT racing a shark? But that's just what Phelps will be doing.
Continue to the next page to find out more, and watch the trailer!