Run in the Heat = Run Stronger
Summer miles feel brutalâand sweaty. But those hot runs? Theyâre doing more than boost your grit: they trigger real physiological changes that supercharge your training and race-day performance.
đ©ș Whatâs Happening Inside
After around 10 days of heat trainingâmixing hot runs with post-session saunas or bathsâyour body adapts big time. Your plasma volume spikes, your heart pumps more efficiently, and you start sweating earlier and more effectively
Why That Matters for Triathletes
Better hydration, better blood flow, and better thermoregulation donât just help your runâthey carry over to bike and swim legs, too . Plus, the perks stickâmeaning youâll feel stronger even on cooler race mornings.
Quick & Easy Heat Plan
Hereâs a smart 2âweek plan:
- 5 hot runsâearly morning or midday with light gear
- 3 post-run saunas or baths (30â40âŻmin each)
- Stay hydrated & check electrolytes
- Keep hard workouts easyâmoderate at first to avoid heat strain
Pro-tip: Passive Heat Works
Research shows passive heat (like sauna after runs) is powerful. One study had endurance athletes soak 30â40âŻmin, 3â4Ă/week, giving gains in VOâ max and heat toleranceâwithout extra workouts.
Safety First
- Start slow: lighter runs or shaded routes
- Monitor your heart rate
- Cool down if you feel dizzy or nauseous
- Avoid adding heat when you’re sickâyour body’s already stressed
đ§ Bottom Line
Smart summer heat trainingârun in the heat, hit a sauna post-run, hydrate wellâtakes about 10â14 days, and delivers massive triathlon benefits: more blood, better cooling, and stronger performance across swim, bike, and runâwhether itâs July sun or October chill.