RIO DE JANEIRO, BRAZIL - AUGUST 14: Michael Phelps of the United States speaks during a press conference at the Main Press Centre on August 14, 2016 in Rio de Janeiro, Brazil. (Photo by Jamie Squire/Getty Images)

Here's how Michael Phelps enjoyed his first day of retirement

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Phelps posted a precious photo to Instagram with fiancée Nicole Johnson and 3-month-old baby boy Boomer in the pool as he kicked off his retirement.

"There’s nothing like being back home. Great way to spend my first day in retirement," Phelps wrote on Instagram.

Take a look at the family snap below:

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