For a long time, I thought hydration just meant drinking enough water.
In basic training, we’d march with web belts and canteens, getting yelled at to hydrate. So we chugged. That was the drill—drink water, fill up, drink more. No one ever talked about sodium. No one mentioned electrolytes. If you cramped, you were soft. If your stomach turned, well, drink more water.
That mindset stuck with me. For years, I trained that way. I raced that way. And yeah, I suffered that way.
When Water Isn’t Enough
At first, it was just cramps. Then came the real issue—GI shutdown. I’d be cruising along, feeling good, and then boom. My stomach would revolt. I couldn’t eat. Couldn’t drink. Couldn’t run. My fueling plan would collapse and I’d be walking it in, dazed and drained, watching the finish line drift further out of reach.
It took years—and a few brutally hot races—for the lesson to sink in:
Hydration isn’t just about water. It’s about what your body loses and what it needs to keep going.
Everyone Sweats Differently
Some people are heavy sweaters. Some lose a lot of sodium. Some don’t. If you’re training in the heat and just drinking plain water, you might be diluting what little sodium you have left, making things worse instead of better.
Your sweat profile is personal. It’s not about copying someone else’s plan. It’s about knowing how your body handles stress, heat, and fluid loss—and replacing what you actually lose.
That’s where heat training becomes a secret weapon. Every run becomes a data point. You start to recognize your limits. You learn how much you can drink, what mix works, and how to keep the engine running clean.
The Real Game-Changer
Once I started dialing in hydration for my body—not just “more water”—everything changed.
Fueling started working again. My stomach stopped shutting down. I could go longer. I recovered faster. I stopped fearing the heat and started using it.
The difference isn’t subtle. It’s a full-on gear shift. You can train harder. Build deeper fatigue resistance. Finish stronger. The heat goes from being the enemy to being your training partner.
Hydration isn’t just something you survive. When you do it right, it becomes one of your sharpest tools.
If you’re training through heat this season, take it seriously. Understand your sweat. Respect the salt. And give your body what it actually needs.
That includes your gear.
Class 5 shirts are built to stay light and breathable, even when you're drenched. No heavy cotton, no soak-through, no nonsense. They're made for hydration to work the way it's supposed to—without your clothes becoming a liability.
