Description:When Michael Phelps isn't breaking records and winning gold medals he takes part in a new, expensive habit...playing poker. The Olympic swimmer has reportedly taken a liking to high stakes poker tournaments, and his hunger for competitiveness doesn't come cheap. According to the social gambling news site, Chiplist, when Phelps first started playing, he began working with the $1/$2 level tables but now buys in to a weekly $25,000 game. Chump change, Phelps is worth an estimated $45 million.(1:07)