In an interview, Marty and Joshua Seldman, father-and-son authors of the book Executive Stamina, talked about work, health, and life balance. Marty said that most executives see themselves as having a mental job, but there's a strong physical component. They need to be in top physical shape. Joshua added that fitness will save you time in the end. When people get stressed, paying attention to health can be the first thing to go. A lot of the workouts are short, but the amount of energy that you get from exercise increases your productivity.