Tony Schwartz  is the CEO and founder of The Energy Project and bestselling author of The Way We’re Working Isn’t Working, published in 2010.

Earlier this week, I had a call with the chief executive of a $5 billion company who has traveled four to five days a week for many years. She sounded utterly exhausted. “When times get tough,” she told me, “the only way I’ve ever known is to muscle through. I just can’t do it anymore. I’ve hit bottom. The problem is that I’ve been numb for so long, I’m honestly not sure if I can find my way back to a sane life.”