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Michael Phelps threw out a first pitch after going through his signature warmup

We all know that Michael Phelps is a great athlete. He's the most decorated Olympian of all time with 28 medals across four Olympics. Phelps was at Chase Field Saturday when the D-backs took on the Mariners. But, he wasn't taking advantage of the park's pool. Instead he was throwing out the first pitch.

As an Olympic athlete, Phelps knows the importance of a proper warmup. So prior to throwing his pitch, he loosened his arm and led Archie "Hollywood" Bradley through his signature warmup routine. The result was a successful pitch:

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Since it's Players' Weekend, the D-backs' Twitter account had an idea for Phelps' jersey:

Even from his first pitch, you can tell how Phelps has had such a long and successful swimming career. It's all about making sure the shoulders are loose before working out.