Part of what may contribute to McMahon's energy levels is all the gym time he puts in. Regular work-outs help to create energy, and McMahon has a gym right there in his office. Beyond the energy benefits, gym work also develops discipline and focus. It becomes second nature to work for results, increasing weight as you become stronger. That kind of gym doctrine is applicable to all parts of life, which is something McMahon does. He sets goals, works hard to attain them, then sets the goal even bigger. In an interview with Muscle And Fitness, he even revealed that he outlifted Mark Henry on the weights. That gives you some idea of just how involved the 69 year old McMahon is in the gym. It has made him physically strong, but also mentally strong. He derives so much of his energy and confidence from his physicality.