#1 Brock Lesnar
And finally, Brock Lesnar is the most decorated athlete on this list which is why he comes at number one. He has competed in the UFC, where he was one of the biggest box-office attractions at the time, having also been the UFC World Heavyweight Champion.
The Beast is currently wrestling in the WWE on a part-time deal on Raw where he is the Universal Champion. All in all, Lesnar has also held multiple world titles on WWE, having also been the superstar to break The Undertaker's historic undefeated streak at Wrestlemania 30.
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However, after Lesnar left the WWE in 2004, he signed a contract with the NFL as he played for the Minnesota Vikings in the Defensive tackle position.
He played during many pre-season matches for the team, as well as receiving an opportunity to play in the NFL Europa, but The Beast refused because he wanted to stay with his family in the US.
Whilst his career in the NFL wasn't successful, it's clear that Lesnar still went out to try something fresh for a new experience.