Races aren't lost at the finish.
They're lost at mile 18.
The truefuels system is built for what happens after the easy miles run out.
Informed Sport certified · Built by Alistair Brownlee · 4.86★ (200+ reviews)
60–90% of endurance athletes underfuel.
The wall, cramp and overheating are fuelling failures — not fitness failures.
Hitting the Wall
Your glycogen stores last 90-120 minutes at race pace. After that, the brain goes first — fog, confusion, loss of pace judgement. This is the wall. A fuelling failure, not a fitness failure.
Energy Gels
Cramps
Calf cramps at km 35 are a sodium deficit compounded over 3+ hours — not bad luck. Electrolytes aren't a race-day top-up. They're a daily training habit. Water alone doesn't replace what sweat takes.
Electrolytes
Heat
75-80% of exercise energy becomes heat. On a warm race day, the body's cooling system can't keep pace — performance drops 5-10% before you realise why.
CoreCtrl
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.
RACE READY SYSTEM
40× Energy Gels + 20× Electrolyte sachets + 8× CoreCtrl sachets + FREE truefuels bottle
TRAINING BUNDLE
20× Energy Gels (mixed low + high salt) + 20× Electrolyte sachets
Gel — Low Salt (0.25g)
40g carbs · 0.25g salt · cool conditions · training
Gel — High Salt (1g)
40g carbs · 1g salt · hot / long efforts · heavy sweaters
Electrolytes
400mg sodium · 150mg potassium · 25mg magnesium
CoreCtrl™
4,000mg taurine · cramping + heat management
Frequently Asked Questions
Start fuelling at 45–60 minutes regardless of how you feel. Take a gel every 30–45 minutes after that. Don't wait until you're tired — by then glycogen is already depleted. Build this habit in training first: start at one gel per hour and add gradually.
For most runners: 2–3 gels over a half marathon. Use the calculator with your target finish time and conditions for a precise number. In warm conditions add an extra electrolyte sachet per hour.
60-90g per hour for efforts over 90 minutes. Start at 30-40g/hr and build week by week — the gut needs training to absorb at the higher end. truefuels gels are 40g each.
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