You ski, run,
and ride.
The gym work
is for that.
Most programs assume a fixed schedule and a body with no history. Yours has both — three sessions one week, one the next, and a knee with opinions.
Treeline programs it around your sport, your season and the days you can get.
Tell it what your body won’t do. In your own words.
Six questions set the frame: sport, season, how often you get out, what equipment you have. Then you type the constraint, and it comes back with specific swaps and the reasoning behind each one.
Right knee doesn’t like deep squats or high-rep lunges.
Squats on Monday because you ski on Sunday
One program holds the gym days and the sport days. Monday’s squats sit six days clear of Sunday’s three-hour lap. Tuesday got skipped — it stays skipped, and next week is planned from the week you actually had.
Built for the middle
Training apps aim at the ends — someone who has never squatted, someone chasing a mirror, someone whose whole day is training. In between there is everyone who is genuinely good at something and fits it around a life.
- Beginners who need a squat taught
- Lifters training for the mirror
- Athletes with nothing else on
- Anyone who wants a coach in their DMs
If that’s you, there are better apps for it, and we’d rather you used one.
- People who have been doing this a while
- People who lift so they ski, run and ride better
- People with a job, a family, and a season they care about
Why we called it Treeline
The treeline is the elevation where the trees stop and the terrain you came for starts. Nobody trains for the treeline. You train below it, on a Tuesday, in a garage or a commercial gym, so that the handful of days you get above it go the way you want.
That’s the whole brief for this app: everything that happens down here, in service of what happens up there.
Treeline Fitness is made by a small team at Foundry24. We built it for ourselves first: jobs, kids, a season we care about, and enough training history to know what we wanted a program to do differently.
Before you decide
No. You tell it what equipment you have — a full rack, a pair of dumbbells in a basement, a hotel gym for two weeks — and the program is built from that. Change the answer and it rebuilds.