Greg Glassman, founder of CrossFit
CrossFit is a lifestyle characterized by safe, effective exercise and sound nutrition. We recommend basing your diet on lean proteins, garden vegetables (especially greens), nuts and seeds, some fruit, little starch, and no sugar. We have always said the needs of an Olympic athlete and our grandparents differ by degree not kind. By that we mean CrossFit works for anyone, because the functional movements we train are essential to improving fitness and maintaining functional independence. With appropriate scaling, an athlete will make significant fitness gains by working at their relative level of physical and psychological tolerance.