Clint Eastwood became famous in Hollywood for being frustrated by directors in movies he played in. Eastwood would often comment that he was bothered by directors insistence to re-shot scenes multiple times until perfection. When the actor began directing in the 70’s, he decided to avoid doing all the things he hated as an actor, meaning he would usually film only one take for each scene. As a result, he would often finish filming on time and within the budget.
Staying fit is certainly a commitment. Besides doing the physical training, there are some other factors to consider, like nutrition