A friend of mine is a relentless self-improver. He's always looking a performance edge. He has multiple degrees. He regularly attends seminars and conferences. He has accountability buddies. He pays a leadership coach, a strategy coach and even an empathy coach.

He doesn't burn the candle at both ends. His candle is one big flame.

Yet, he's almost always run-down. He's often fighting a cold. Once every month or two his body basically breaks down, and it takes him days to recover. 

Please select this link to read the complete article from Inc.