05/03/2026
🔥 This summer has been next-level hot, and it’s taken me right back to basics.
Fatigue mechanisms.
Thermoregulation.
And how heat adds an entire extra layer of physiological stress to training.
Some of the athletes I’ve worked with this summer have been training in:
🌡️ 37–41°C ambient temperatures, which is honestly wild.
Others, up north?
Lower temps… but 🌫️ much higher humidity and wow, that’s a whole different stress load.
Here’s the part that often gets missed 👇
Heat doesn’t just make training feel harder.
It fundamentally changes what’s happening inside the body.
What heat actually does to performance:
🔥 Accelerates glycogen depletion → earlier fatigue at the same workload
🔥 Drives RPE up sessions feel harder without any change in pace or power
🔥 Reduces central drive the brain downregulates output to protect the body
👉 If it feels harder, it is harder.
So what does this mean in the real world?
Heat raises the cost of every session.
Same athlete.
Same training plan.
🔥 Much higher physiological stress.
Which means athletes training in the heat need:
🍚 more carbohydrate, not less
💧 smarter hydration + electrolytes
🧊 intentional cooling strategies
🛌 greater respect for recovery
Trying to “push through” heat without adjusting fuel or recovery doesn’t build resilience; it accelerates fatigue and maladaptation.
Summer training demands respect.
Fuel it properly.