Jennifer Goldsack had never felt so exhausted in her life.

A former Olympic rower, she was trained to read every signal in her body ahead of high-performance events. Now the CEO of a digital healthcare nonprofit, she was traveling from Florida to Las Vegas for a major conference, HLTH. She'd be sharing the stage with industry titans while juggling 7 a.m. executive breakfasts, back-to-back meetings to secure new partnerships, and late-night mixers. She'd spent weeks preparing for it.

As she got off the plane, the fatigue felt so extreme that she started to worry. She could barely string two sentences together. Was she crumbling under the pressure? On her way to the hotel, she cracked open a large Red Bull, and a thought hit her harder than the caffeine: This isn't normal. Something is wro

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