Successful people have an energy about them. It's one of their most valuable resources. We asked many of the most successful people we know where they would put energy on the scale of requirements for success. All placed it in their top three. They were not talking just about physical energy, but about that hard to describe internal energy - in fact, when pressed, almost all placed internal energy above physical energy in terms of critical attributes.

How do they get and maintain their high level of personal energy?

Here's what they told us about creating personal energy.

The first thing is understanding that a high level of personal energy is a critical success factor, and then placing a high value on the things that create it - and treating the things that reduce it as enemies to success.

It's knowing that personal energy comes from within. There are external sources of stimulation that can add to energy in the short term, but the real source of personal energy is inside.

Optimism, and thinking in terms of opportunities creates personal energy. Pessimism and consequence thinking can suck the energy right out of anyone - even the most optimistic.

Good health - both physical and mental - provides the platform for high personal energy. Taking care of that health is critical. At the same time many highly successful people have overcome very difficult physical and mental issues to create the energy necessary to succeed. That's where optimism and opportunity thinking are so very critical.

It's getting up and acting that creates energy. One of our leaders attended a Hugh O'Brian Leadership Seminar when she was in high school. After the seminar she was asked what was the thing she remembered the most. Her answer was" To be enthusiastic you must act enthusiastic." Having actions control emotions creates personal energy.

Curiosity - a sense of discovery - wanting to know more - and then taking action to gain knowledge - creates personal energy. It's a key way to stay out of a rut. And remembering that the only difference between a rut and a grave is a rut's longer.

It's drawing inspiration from the accomplishments of others - and drawing strength from what they had to overcome to succeed. Reading biographies of successful people is a way many of our leaders create and renew their energy.

It's overcoming fear - today. And overcoming that little voice-demon that sits on everyone's shoulder and says "take it easy" and "be careful" and "this could be a mistake" and 'be afraid."

It's laughter and finding joy in everyday things. It's great to be able to laugh at a good joke - it's absolutely terrific to smile at the little child holding their mom's hand.

It's positive relationships - the kind that add optimism. And it's avoiding toxic relationships - the kind that pull down, create pessimism and destroy energy.

It's giving without keeping track of payback. Years ago one of our leaders was given a terrific piece of advice. "If you want to make a friend, let them do something for you." It works. We all - or at least most of us - want to give - to help.

It's realizing the toughest thing to do is to start - but once in motion, good things will and do happen. A very fit friend tells me the hardest part of a session at the gym is driving there. Once there, the exercise takes on a life of its own. Same thing with all kinds of things.

It's realizing that personal energy is a variable - from day to day the level of personal energy varies. But exerting the discipline to keep personal energy competitive on even the toughest day has its own rewards. Keeping the promises we make to ourselves creates energy.

A personal experience one of our leaders had illustrates that point.

She was working out at a gym. She'd had a bad day and wasn't feeling particularly optimistic or happy or opportunistic. As she worked to meet her time and distance goals, it became apparent that she was really laboring. The thought of just quitting started to be attractive. Then it struck her just how much her mental state of mind was impacting her level of physical performance. Her results that day were a good 10% less than normal performance. But at the end of the workout, she felt really good about overcoming those negative emotions to accomplish something she had promised herself she would do. That little demon perched on her shoulder had been trying to tell her to "give up", to "try again another day." She ignored it. A small victory. It'll be back, but she knows she can overcome it. That realization felt good - felt energizing. Action guided emotion.

Take a few moments - right now - and assess your level of energy. Then pick out one of the ways our leaders use to increase their energy levels. Laugh, smile, think about an opportunity. Discipline yourself to take action, and have that action control your emotions. Be prepared to be amazed at how your thoughts and actions can and will lift your energy level.