Fuel your training,
not guesswork
FuelSync connects to your watch — Garmin, Apple, Coros, or Suunto — and applies AI models to deliver exact nutrition targets, adaptive injury-risk scoring, and recovery insights, all fully customizable to how you train.
AI-powered. Fully customizable.
Built on sports science.
Every recommendation is driven by adaptive models built on your actual training data — not population averages, not generic templates.
AI-powered models
EWMA exponential decay, confidence-weighted recovery scoring, and terrain-adjusted impact load — adaptive models that make every recommendation sharper over time.
Fully customizable
Supplement catalogue, food preferences, nutrition thresholds, and race targets — every parameter is yours to configure. The app adapts to you, not the other way around.
Training-aware nutrition
Carb and protein targets scale with your Training Effect score. An easy 5 km and a hard tempo session get different prescriptions — automatically.
Impact Load monitoring
Terrain, running form, and intensity zones combine into a single injury-risk signal. Know when to push and when to hold back.
Recovery score & velocity
HRV, body battery, and readiness fused into one confidence-weighted score. Recovery Velocity tracks how many hours your body needs to bounce back after each hard session.
Race fueling planner
Minute-by-minute gel, sodium, and hydration schedule built from your target pace, heat, and supplement catalogue — synced to your watch as on-device reminders.
Post-workout self-evaluation
Rate how each session felt — from Very Weak to Very Strong — and log your perceived effort (RPE 1–10). Every rating is fed directly into the AI model, sharpening its recovery estimations and making each nutrition recommendation more precisely tailored to how your body actually responds.
Exponentially weighted impact km/wk — 7-day acute vs 42-day tolerance
Acute load
47.2 km/wk
7-day EWMA
Tolerance
54.1 km/wk
42-day EWMA
Safe next wk
52 km
46.3 km so far
Know your real
injury risk
Raw mileage doesn't tell the full story. FuelSync weights every kilometre by the terrain you ran, your running form, and the intensity zones you trained in — then applies an exponential decay model so recent sessions count more than last week's.
The result is an acute-to-tolerance ratio grounded in the same sports science as your watch's built-in load metrics — but with a transparent formula you can understand and act on.
All your recovery
signals in one score
Your watch gives you HRV status, body battery, and training readiness as separate numbers. FuelSync fuses them into a single confidence-weighted recovery score — so you always know at a glance whether today is a push day or an easy day.
The dashboard also estimates your glycogen status and shows how today's nutrition plan will replenish it by tomorrow.
"Good recovery metrics today. Strong readiness to build on yesterday's session."
How fast are you
actually recovering?
Recovery Velocity doesn't just tell you how you feel today — it measures how many hours your body actually takes to bounce back after each hard session, and tracks whether that number is trending down over time.
A shorter recovery arc means your fitness is genuinely adapting. A flat or rising trend is an early warning that fatigue is outpacing absorption — often visible here weeks before it shows up in your runs.
- Each dot = one hard session; size scales with Training Effect
- Colour = intensity: yellow moderate, orange hard, red very hard
- Dashed line = rolling average — the trend that counts
Hours to full recovery after each hard session
Gel by gel.
Kilometre by kilometre.
FuelSync builds a precise fueling schedule from your target pace, body weight, heat index, and supplement catalogue — then maps every intake to an exact distance marker on your route.
- Carb intake matched to your burn rate per kilometre
- Caffeine timed for your hardest sections
- Pushed as distance alerts directly to your Garmin
Fueling Timeline · 30km long run
154g carbs · 7 gels5km
Energy Gel
22g
10km
Isotonic Gel
22g
14km
Roctane
22g☕
18km
Beta Fuel
22g
21km
Jet Blackcurrant
22g☕
25km
Energy Gel
22g
28km
Roctane
22g☕
☕ Caffeine timed for the km 14 tempo section and km 21 push — peaks ~45 min after ingestion.
Based on your 10.2 km threshold run · TE 4.2
Calories
2,840 kcal
+340 kcal vs rest day
Carbohydrates
340 g
Protein
95 g
Hydration
2.8 L
Fuel exactly
what you burned
Your carb target on a 10 km easy run and a 20 km long run shouldn't be the same. FuelSync reads your Training Effect score and adjusts your macros for each individual session.
The race fueling planner builds a minute-by-minute schedule — when to take each gel, how much sodium per hour, and how to adjust carb density for heat. Every detail calculated from your target pace and your own supplement catalogue.
When your plan is ready, send it straight to your watch as on-device reminders. You get the right cue at the right kilometre — no phone, no spreadsheet, just a tap on the wrist.
- Gel timing, sodium, and hydration at every stage
- Syncs to your Garmin watch as on-device workout reminders
- Adjusts for heat, humidity, and your personal sweat rate
Ready to fuel smarter?
Connect your Garmin account and get your first personalised nutrition plan in under a minute.
Get started free