What Sub24 is for

Ultra runners of every level, from a first 50k to a multi-day mountain race, and the crew and pacers who get them to the finish. Whether you’re chasing a podium, a sub-24, or simply beating the cutoff, the planning problem is the same: how do you fuel, drink and pace a long day over real terrain without guessing?

It’s as useful to a beginner who’s never thought about sodium as it is to a veteran who wants their crew sheet to update itself on the day.

• Fuelling & hydration. Carbs, fluid, sodium and caffeine per hour, turned into exactly what to eat and drink at each aid station and on the legs between.
• Pacing over real terrain. A pace for every climb and descent from your route’s GPX, not just a flat-ground average, adjusted for fade and night running.
• Aid, drop bags & crew. What’s at each aid station, where your drop bags go, the cutoffs, and when your crew need to be where.
• Race day, live. Tick off checkpoints and share a live sheet so your crew and pacers always know your ETA and buffer.

None of this is novel research. It’s the bookkeeping ultra runners already do in their heads and spreadsheets, terrain affects pace, fatigue compounds with distance, night is slower, sweat drives how much sodium you need, done consistently and allocated across the whole race in a way that survives contact with reality.

The numbers in any sports-nutrition or pacing textbook are fine. The hard part is turning them into “what do I carry out of checkpoint 4, and how fast do I climb to 5?” That’s the gap Sub24 fills.

Built by an ultra runner, for ultra runners and the people who crew them. Sub24 is in alpha, so if something here is wrong, off, or missing, tell us, that feedback is the whole point right now. Questions: hello@sub24.run.