MMA legend Frank Shamrock didn’t earn his status as one of the sport’s greatest of all time by entering bouts out of shape. In fact, the 39-year old still has a physique men half his age would be jealous of thanks in large part to his dedication on the fitness front.

Check out one of Shamrock’s routines below and you’ll have a better idea of why he was a handful for every adversary he faced in his prime!