Tune into any sports event and you'll catch sight of athletes emblazoned with the logos and trademarks of various companies, their shirts and equipment sporting Nike swooshes, American Express credit cards and General Motor's initials. Endorsements are a million dollar business, with some athletes like Tiger Woods earning up to sixty million dollars per year for simply wearing a certain set of clothing or using a certain kind of golf club. Given that, perhaps it's no surprise that a long list of celebrities and athletes have come out an endorsed P90X, citing it as their favorite means of getting in shape. What might be surprising, however, is that they're not paid to do so; each celebrity or professional athlete that praises P90X publicly is doing so of their own free will. So who are these celebrities, and what have they said about P90X?