“Michael Phelps, this is a message to you, “ Hart began in a video filmed in a pool and shared on his Instagram with the caption, “This message is for you @m_phelps00 …..I’m on yo ass ...

investing in several brands and working with his eponymous Michael Phelps Foundation and swimwear line, MP, which has largely contributed to the sport's commercial growth. Phelps has also endorsed ...

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