Greg Glassman is an American fitness entrepreneur best known as the co-founder of CrossFit, a high-intensity fitness program that combines elements of weightlifting, aerobic exercise, and gymnastics. He started CrossFit in 2000, aiming to create a workout regimen that could be adapted for individuals of all fitness levels. Under Glassman's leadership, CrossFit grew rapidly, becoming a global phenomenon with thousands of affiliated gyms and a dedicated community. However, he faced controversy in 2020 due to comments he made regarding social issues, which led to his resignation as CEO of CrossFit, Inc..