Forget Eight Glasses a Day — Here's How Much Water Your Body Actually Needs to Perform
The 'eight glasses a day' rule is one of the most repeated — and least accurate — pieces of health advice out there. Your actual hydration needs depend on your body, your workouts, the weather, and a dozen other factors. Here's the science-backed way to figure out your personal hydration sweet spot and why getting it wrong in either direction is hurting your performance.