Rucking · iPhone and Apple Watch
Every step priced for the weight you carry.
FueledRuck is a rucking tracker for iPhone and Apple Watch. The live map is the hero, and every number under it comes from load-carriage physics the US Army uses to plan marches, so calories, pace and training load reflect what was on your back.
In beta on TestFlight · coming to the App Store
Drink about 5 oz
A sample ruck at 180 lb body weight, on the app's demo loop.
Why weight changes everything
Most trackers treat a ruck like a walk.
A 30 lb pack changes what a mile costs, and sand or brush changes it again. FueledRuck runs the Pandolf load-carriage equation (USARIEM, 1977), with the Santee downhill correction, on every GPS fix. Body weight, load, speed, grade and terrain all count.
The same number drives everything downstream: the energy total, the fuel and hydration plan, training load, and the guardrails that flag a week that jumps too fast.
1.5W + 2.0(W+L)(L/W)² + η(W+L)(1.5V² + 0.35VG)W body mass · L load · V speed · G grade · η terrain · in wattsWhat does your load cost?
Estimates from a published model, not lab measurements. In the app the grade comes from your route, second by second.
Below Z1Z5
After the ruck
See where it got hard.
Every ruck's map paints itself by heart-rate zone, pace, grade or elevation. Scroll, and this one does all four.
An example: the app's demo loop, 8.05 miles at 35 lb, with its effort worked out from the app's own energy math.
Splits
Each mile, with the hill in it.
Splits carry heart rate and grade. Personal bests are kept by load class, and a weekly load-mile trend shows the real volume, because a mile at 45 lb isn't a mile at 20.
| Mile | Pace | Avg HR | Climb |
|---|---|---|---|
| 1 | 17:30 | 131 | +124 ft |
| 2 | 17:15 | 136 | +119 ft |
| 3 | 15:57 | 112 | +0 ft |
| 4 | 15:45 | 113 | +0 ft |
| 5 | 17:21 | 137 | +112 ft |
| 6 | 17:14 | 142 | +121 ft |
| 7 | 16:02 | 123 | +7 ft |
| 8 | 15:48 | 122 | +5 ft |
See how it went
Fly it back in 3D.
Every ruck replays as a pitched flyover, with distance, time and heart rate ticking along and the elevation profile underneath. In the app it flies over real satellite terrain, stops at the photos you took, and exports as a vertical video for your story.
Fuel plan
Fuel and hydration
Pack the right water.
Before you step off, FueledRuck estimates your sweat rate from the load, the pace and the weather, and tells you what to carry. On the ruck, drink and carb cues arrive on your wrist and in your ear. At the finish, it tells you what you lost and what to put back.
- Grounded in ACSM fluid and carbohydrate guidance
- One tap logs each drink, so the refuel math is yours, not a guess
The plan here uses the load you picked up top, a 16:00 mile and 180 lb. In the app it uses your weight, your pace and the weather where you are.
Solo rucks
Someone should know.
Set a back-by time and FueledRuck checks in with you. Share a live link that anyone can open in a browser, no app needed: the route so far, distance, time and load. It turns red if you're overdue, and it deletes itself a day after the ruck.
- Add 30 minutes or mark yourself safe right from the notification
- Text your location to your check-in contact in one tap
Rucking now
Sam
Started 9:30 AM · back by 11:00 AM
Train for the real thing
Plans that bend to your log.
Pick a standard or an event and FueledRuck builds the weeks to get there. Work rises no more than ten percent a week, every fourth week steps back, and a week repeats when life gets in the way. A ten-second check-in after each ruck (effort, shoulders, feet, blisters) tunes the next one.
Build a plan
BuildStep backTaper and test
The standards
The pace each one asks for, with the weight on. A live ahead-or-behind clock rides the map while you ruck one.
- 12-Mile Foot March
US Army · Ranger / EIB
15:00/mi12 mi · 35 lb · 3 h
- Combat Fitness Test
British Army · Infantry
15:00/mi8 mi · 25 kg · 2 h
- Norwegian Foot March
Norwegian Armed Forces
14:29/mi30 km · 11 kg · 4 h 30 m
- Proficiency Badge · Gold
German Armed Forces
16:06/mi12 km · 15 kg · 2 h
- Base
FueledRuck ladder
18:00/mi3 mi · 20 lb · 54 min
- Build
FueledRuck ladder
16:00/mi6 mi · 30 lb · 1 h 36 m
- Hold
FueledRuck ladder
15:00/mi10 mi · 35 lb · 2 h 30 m
Apple Watch
Leave the phone at home.
The Watch app rucks on its own: its own GPS and heart rate, load-aware energy in place of a walking estimate, and the workout saved to Apple Health with the route. Turn the Digital Crown to set the load. When the phone comes along, the Watch mirrors it instead, with pause and finish on your wrist.
- Five heart-rate zones by max, reserve or your own numbers, live on the phone and the wrist
- Stack a vest and a sandbag and the load adds up on the wrist too
Straight from the app
Before, during and after.
Also in 1.0
The rest of the kit.
Community
Crews
Private groups on iCloud with a weekly board and, for members who choose to share, a live map of who's out.
Community
Monthly challenge
A load-mile leaderboard with first names and a last initial, with hide and report.
Gear
Packs, vests, sandbags
Stack a vest and a sandbag and the load adds up, on iPhone and Watch, with mileage per item.
Routes
GPX in and out
Import or save a loop, and follow it with off-route alerts on phone and wrist.
Indoors
Treadmill mode
Speed and incline from the belt, into the same energy model.
Photos
Your photos on the route
The shots you took on the ruck, pinned where you took them. They stay in your library.
iPhone
Live Activity
The Lock Screen and Dynamic Island, with pause and resume.
iPhone
Widgets and Siri
The week ring on the Home and Lock Screens, and a start from the Action button and Control Center.
Privacy
No account
No ads, analytics or tracking. Rucks, health data and photos stay on your devices unless you share them.
FueledRuck Pro · in-app purchase
A training system on top.
$29.99a year
with a 7-day free trial for new subscribers
or $4.99 a month, or $59.99 once
FueledRuck Pro goes on sale when FueledRuck reaches the App Store. Family Sharing included.
Comes with the app
- The live map
- Load-aware energy
- Splits
- Your log
- One pack
- Live heart rate
- The safety check-in and live link
- The recovery check-in
- Widgets
FueledRuck Pro adds
- Adaptive training plans
- Every rucking standard live on the map
- Heart-rate zones
- The fuel and hydration coach
- 3D route replay with video export
- Share cards
- Apple Health workouts
- The Apple Watch app (including rucks without your iPhone)
- Unlimited packs
- Crews and the monthly challenge
Payment is charged to your Apple Account when you confirm the purchase, or when the free trial ends. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel in Settings › Apple Account › Subscriptions. Terms of Use · Subscription terms · Privacy
Status
In beta on TestFlight now.
FueledRuck 1.0 is open to testers on TestFlight ahead of the App Store. Open the link on your iPhone: it installs TestFlight, Apple’s beta app, and then FueledRuck.
Join
Tap Join on TestFlight on your iPhone and follow Apple’s steps. Pro purchases in TestFlight are Apple’s test purchases, and nothing is charged.
Go ruck
Check that the map turns with you, the fuel cues land at sensible times, and the finish screen makes sense.
Try the Watch alone
Leave the phone at home for one ruck. On another, send a friend your live link.
Tell us what breaks
Take a screenshot in the app to send feedback through TestFlight, or email [email protected].
Questions
Is it on the App Store?
Not yet. FueledRuck is in public beta through Apple’s TestFlight app, on iPhone and Apple Watch, ahead of the App Store.
Do I need an Apple Watch?
No. Your iPhone tracks the whole ruck. A Watch adds live heart rate and zones, and it can ruck on its own with the phone at home.
How close is the energy number?
It's an estimate from the Pandolf equation with the Santee downhill correction, using your weight, load, speed, grade and terrain. It's closer to what a loaded ruck costs than a walking estimate, but it isn't a lab measurement.
Does it work without a signal?
Yes. GPS doesn't need a phone signal, so the ruck records anywhere. The live link needs data to update; without it, the page shows when it last heard from you.
Where does my data go?
It stays on your devices unless you share it. There's no account, and no ads, analytics or tracking. The weather lookup sends Apple your location rounded to about 1 km, and a live link sends your position to our server only while it's on. The link is deleted a day after the ruck.
Miles or kilometres?
Either. Pick miles and pounds or kilometres and kilograms in the app.
Ruck like it's your job.
FueledRuck is in beta on TestFlight for iPhone and Apple Watch, ahead of the App Store.
Join the beta on TestFlight