Heat doesn't just make you uncomfortable.
It actively degrades your performance.
A science-backed guide to fuelling,
cooling and electrolyte strategy for
athletes training and racing
in hot conditions.
Informed Sport certified ·
Built by Alistair Brownlee ·
4.86★ (200+ reviews)
Your Race Fuelling Calculator
Enter your race details and get a personalised gel and electrolyte plan.
Products & Bundles
Start with a bundle or build your own stack. Bundles save you vs buying separately.
CoreCtrl™
4,000mg taurine · 300mg potassium · 60mg magnesium
Energy Gels
40g carbs · 0.25/1g salt · hot weather · heavy sweaters
Electrolytes
400mg sodium · 150mg potassium · 25mg magnesium
Race Ready System
40 Energy Gels · 40 Electrolyte Sachets · 8 CoreCtrl Sachets
"Racing Kona in heat is a completely different physiological challenge. Everything about your fuelling and cooling strategy has to adapt."
— Alistair Brownlee, 2x Olympic Champion, truefuels co-founder
Alistair built truefuels because no existing product met the demands of elite triathlon — heat, duration, GI stress all at once. Tested by Alistair and 50+ elite athletes.
Get a free hot-weather fuel plan tailored to your sport and conditions
Personalised gel and electrolyte plan based on your race distance, conditions and target time.
Your fuel plan is on its way.
Check your inbox — usually arrives within a few minutes.
No spam. One email with your plan. Unsubscribe anytime.
Frequently Asked Questions
Increases energy cost, accelerates glycogen depletion, amplifies electrolyte loss. ~1–2% drop per °C above 25°C in endurance events.
Add 1 extra electrolyte sachet per hour above cool-condition baseline when training above 25°C.
Reduces core body temperature before exercise. Can reduce core temp rise by up to 0.5°C — a measurable performance benefit. CoreCtrl is built for this protocol.
Yes — higher sweat rate = higher loss per hour. Use high-salt gel variants + higher sachet frequency in heat.
4,000mg L-Taurine · 300mg potassium · 120mg calcium · 60mg magnesium · 250mg Himalayan rock salt. Zero calories, zero carbs. Designed for heat management.
Train for a specific sport?