Hydration and Performance — The Basics

Hydration is one of the simplest levers in fitness and one of the easiest to get wrong through overcorrection in either direction.

There's no single magic number that applies to every man — fluid needs shift with body size, activity level, heat, and how much you sweat. But the general shape of good guidance is consistent: drink enough that you're rarely thirsty, your urine is pale straw rather than dark, and you're topping up around exercise rather than only when you notice you're parched.

A practical approach, not a rigid rule:

• Start the day hydrated. A glass of water on waking is a simple habit that costs nothing and sets the tone for the day.
• Drink around training, not just during it. Having water in the hour before a session and again afterwards matters as much as sipping mid-workout.
• Thirst is a reasonably good guide for most everyday activity. For short, moderate sessions — the kind most Cadets and Recruits will be doing — drinking when thirsty is generally sufficient. It's longer, harder, or hotter sessions where deliberate fluid planning starts to matter more.
• Plain water is enough for most sessions under an hour. Sports drinks and electrolyte products have a place for longer or more intense efforts, particularly in heat, but they're not a requirement for a standard training session.
• Watch for the opposite problem too. Drinking far more than you need, especially very quickly, can be its own risk. More is not automatically safer than less.

Signs you might be under-hydrated: persistent thirst, dark urine, headache, and unusually low energy during a session that isn't otherwise explained by poor sleep or a hard week.

The honest summary: for most men doing moderate training, sensible everyday habits — water with meals, a bottle during a session, drinking when thirsty — cover it. This doesn't need to be complicated to get right.