Your Fitness App Doesn't Understand Rucking
Strava, Apple Fitness, and Garmin weren't built for weighted movement. Ruck Score was.
Strava, Apple Fitness, and Garmin weren't built for weighted movement. Ruck Score was.
Most fitness apps are built for runners and cyclists. They do a great job tracking distance, pace, and heart rate for those activities. But rucking is fundamentally different — you're carrying a loaded pack over real terrain, and that changes everything about how hard your body is working.
Apps like Strava, Apple Fitness, and Garmin have no concept of pack weight. They can't factor in terrain resistance. They don't understand how a 40 lb ruck on a hilly trail is a completely different workout than a casual walk covering the same distance. As far as they're concerned, both are identical.
If your app doesn't know you're carrying weight, every number it gives you is wrong — calories, effort, training load, all of it.
Let's look at a concrete scenario. A 180 lb person rucks 4 miles on a hilly trail with a 40 lb pack in 75 minutes. Here's how the calorie estimates compare:
Scenario: 180 lb person • 4 miles • hilly trail • 40 lb pack • 75 min
When your app thinks you burned 320 calories but you actually burned 680, everything downstream is off — your nutrition targets, your recovery windows, your progressive overload. You're essentially training blind.
Here's a full breakdown of the factors that matter for rucking — and which apps actually account for them:
| Factor | Strava / Apple / Garmin | Ruckaroo |
|---|---|---|
| Pack Weight | Not tracked ignored | Core input included |
| Calorie Estimate | Walking/running models underestimates | Pandolf load-carriage equation accurate |
| Terrain Type | Not factored in | Adjusts for pavement, trail, sand, gravel |
| Elevation + Load | Tracks elevation, ignores weight | Calculates combined energy cost |
| Effort Score | Pace-based or HR-based | Physiological workload (0-100) |
| Body Weight | Limited or none | Normalizes effort across body types |
| AI Coaching | Generic training tips | Personalized to your ruck data |
Generic apps track movement. Ruckaroo measures effort — and that's what matters when you're carrying weight.
Ruck Score is a single number from 0 to 100 that reflects how demanding a ruck actually was on your body — not just how far you went, but how much work you did.
Two rucks can look identical on a map and feel completely different in real life. One is flat pavement with a light pack. The other is a hilly trail with 45 lbs. Ruck Score captures that difference.
Same distance. Completely different effort.
Ruck Score measures physiological workload, not just miles.
Ruck Score is grounded in the Pandolf load-carriage equation — a model used for decades in military, occupational, and endurance research to estimate the energy cost of carrying weight over distance. Your score accounts for every factor that actually drives effort:
Carrying load affects people differently based on body weight. Ruck Score adjusts for this so results are fair and comparable.
Heavier packs require more energy. The more you carry, the more effort your score reflects.
How fast you move and how long you're out both matter. A long grind and a short fast push are very different workloads.
Climbing costs more energy. Descending still requires effort and control. Ruck Score accounts for both.
Pavement is efficient, trails require more effort, and sand is the most demanding. Your score adjusts based on surface.
Behind the scenes, the process is straightforward:
You don't need to worry about units — pounds or kilograms, miles or kilometers, everything is handled automatically.
It's the gold standard for load-carriage research because it accounts for body weight and carried load together, reflects real energy cost instead of guesswork, and has been validated in real-world carrying scenarios across military and endurance settings. Ruck Score is grounded in how the human body actually works under load — not a generic formula borrowed from running.
While everyone is different, scores generally fall into these ranges:
Higher isn't always better — it simply means more demanding.
Ruck Score isn't about chasing numbers. It's about finally having a training tool that understands what you're actually doing out there.
Every ruck tells a story. Ruck Score helps you understand it.