01
Pick a course
A GPX straight out of Garmin Connect or Strava, a hand-written CSV, or the generated WaterTopia loop. Drop a file on the window and it joins the list.
Browse coursesVirtual world for treadmill running
Your treadmill,
on real ground
Drop in a GPX from your watch. A banner tells you the speed and incline to dial into your console, so what you are doing matches the terrain your avatar is running — at constant effort, not constant speed.
01234567890123456789.01234567890123456789km
of Ventoux, imported
0123456789012345678901234567890123456789m D+
climbed indoors
0123456789records
400 m to marathon
0123456789subs
nothing to pay, ever
How it works
Three things,
then you run
Nothing to configure and nothing to sign up for. Your treadmill stays exactly as it is — the only thing that changes is that you now know what to set on it.
02
Dial the console
The banner names one speed and one incline, handed to you about eight seconds before the stretch it belongs to — long enough to walk a hand to the console.
How pacing works03
Run the terrain
Whatever you actually set, your avatar moves at the speed that effort buys on the real gradient. Set less incline than the hill and you climb it slower.
See the coursesThe coach
It asks for what
your machine
can actually give
A 22% wall on a 15% treadmill clamps the incline and pays the difference in speed. The banner says so, instead of asking for the impossible.
Effort, not speed
Energy cost per metre as a function of gradient comes from Minetti et al. 2002. On a 6% climb the coach sets 6% incline and the belt speed that costs the same energy per second.
Stretches, not slopes
A console is four button presses away from your hand, so the course is cut into stretches of a few hundred metres. A 12 km activity comes out as 33 instructions, not one every eight seconds.
A descent is run with the legs
Past roughly −10% the limit stops being aerobic and becomes how hard the legs can brake, so the speed a descent buys you is capped. The effort maths is untouched.
Real courses
A GPX is not
a course. Yet.
GPS fixes bunch up wherever you slowed down, barometers drift, and a track that doubles back records the same road at two different heights. All of it is cleaned at import.
Re-spaced, averaged, measured along the path
Even 5 m spacing, a 20 m elevation average, and grade taken along the road rather than as horizontal displacement — otherwise a turnaround reads as a 45% wall on flat ground.
Two passes over one road, reconciled
An out-and-back is one road run twice. A stretch that comes back over ground it has covered is pulled onto the line it ran first, and the duplicate ribbon is never painted.
Scenery that belongs to your route
The road is carved into the ground so you never float above it, a closed loop floods into a lake, and forest, rock and snow land where the terrain puts them. No two imports look alike.
Sample activity−45% … +22%→−18% … +17%after cleaning
Courses
Every road you have
already run
Bring the roads you already know. The four below are real routes — and the lines you are looking at are their actual elevation, metre for metre.
Mont Ventoux
Ascension par Sault
25.44km1222m D+GPX · one-way
Bergerac SV2
VMA — 3×[4×40″/20″] + 3′
12.25km163m D+GPX · recorded
Hill Repeats
Hand-written CSV loop
1.18km30m D+CSV · loop
The Wall
A 22% ramp, on purpose
0.61km66m D+CSV · one-way
Drop a .gpx or .csv on the window and it is in the list.
The pacer
Race the runner
you were
A translucent pacer runs in the lane beside you. Set it to hold an effort, hold a speed — or load a run you already did and try to take it back.
Constant effort
The pacer slows on the climbs and flies on the descents, the way a human pacer would.
Constant speed
A metronome, for the days when that is exactly what you want chasing you.
My recorded run
Your watch stamped a time on every point. The ghost replays that outing second for second.
Your records
The fastest 5 km
you ran inside a run
Not split times. A rolling window — wherever in the run it started — which is what a personal best actually is. Six of them, from 400 m to the marathon.
They are banked the moment a run ends and when you close the window, so a long run you abandoned half way still keeps the kilometres it ran. Your bests show on the course list and on the finish card, which tells you which ones the run just beat.
Personal bests
- 400 m1:29.8
- 1 km3:57.2
- 5 kmnot set yet
- 10 kmnot set yet
- Half marathonnot set yet
- Marathonnot set yet
Any treadmill
Tell it your top belt speed and your steepest incline. It never asks for more than that.
One number from you
The pace you could hold on the flat. Everything else is worked out from the terrain.
Your own routes
A GPX from Garmin Connect or Strava. Drop it on the window and it is in the list.
macOS, Windows, Linux
One native app. No account to make, nothing running in the background.