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The story behind your coach
Meet Kalle.
And the guy who built him.
Kalle is your coach. I'm Sven – the human who built him. I wanted a coach that reads my morning HRV, knows I got four hours of sleep and a 6 a.m. flight, and adjusts without making me feel guilty about it. So I built one.
Hi, I'm Sven 👋
The problem I had
I'm a 39-year-old dad of two with a demanding job in tech and a stubborn ambition to keep getting fitter into my 40s.
Real coaching is brilliant and expensive. Generic plans ignore how you slept and what life threw at you this week. Tracking apps hand you data without telling you what to actually do tomorrow. I wanted something that closed the gap between the numbers and the decision.
So I built one. Kalle is the coach I wished I had.
Not a pro. Proof you don't have to be.
I coached myself through most of this – reading sports-science papers at night and testing them on my own legs. Kalle is everything I learned, minus the trial and error.
- 315km
- Vätternrundan, ridden twice – both under nine hours
- 100km
- Embrace Triple Trail Ultra, my first ultra
- 171km
- Fuji 100 – 7,300 m of climbing in a single day
- Top 10%
- of my wave at the Fuji 100, a first 100-miler
From road to trail
A snowboard crash turned “I hate running” into an ultra runner.
I rode Vätternrundan twice, then a broken wrist somehow rerouted me onto the trails. Six months later I ran my first 100 km. Six months and two surgeries after that, my first 100-miler at the Mt Fuji 100. The same self-coaching that got me there is what Kalle now does for you – without the years of guesswork.
012× Vätternrundan
315 km around Lake Vättern. Twice, both under nine hours.
02The plot twist
A snowboard crash and a broken wrist turned “I hate running” into something else entirely.
03Ultra runner
Six months later: off the bike, onto the trails, all in.
04100 km
Embrace Triple Trail Ultra – my first hundred.
On Strava
05Fuji 100
171 km, 7,300 m of climbing, top 10% of my wave – two surgeries earlier.
On Strava
The method
How Kalle coaches
01
Rigorous, but human
Every session has a reason: which system it targets, and why today, given your numbers. Kalle leads with what went well, celebrates good judgement, and treats a bad day as the next opportunity – never a failure.
02
A guide, not a contract
Skipping a session because life happened is often the smart call. A low heart rate at high effort is fitness, not slacking – and Kalle knows the difference.
03
Keep it simple
The science can be deep, but your daily decision shouldn't be. Kalle reasons in zones and gives you one clear thing to do today, with the why attached.
04
Built for real lives
A partner, kids, a job, a calendar that fights back – good coaching fits around all of it. You can become a proper “elite amateur” without quitting your day job.
Under the hood
Kalle pulls your training and health data, prescribes your daily workout, logs what you planned versus what you actually did, and gets smarter about you over time.
A coach with a memory. A coach who's always there for you.
The gap between weekend warrior and endurance athlete is mostly consistency, a little patience, and someone in your corner.
Someone who keeps it simple and keeps it kind. That's Kalle. Let's get to work.
– Sven