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Shindo Endurance Training
Your first triathlon, on the watch you already own
Getting into triathlon usually starts with a purchase — a thousand-dollar watch arrives before the first swim lesson does. Shindo takes the other side. Apple Health is the only way data gets in, so any watch that already records sleep, heart rate and workouts is enough. Swim, bike, run, brick and strength, with a race goal that works back from your start date. The plan is adaptive, not a calendar: miss a session or swap a run for a ride, and the week re-flows from where you are.
Hi PH 👋
I built Shindo because I got tired of the integration problem: my watch had a readiness score, one app had my fitness and fatigue curves, and my training plan lived in a spreadsheet that stopped resembling my life by week three. Every morning I was doing the synthesis myself, badly, at 6am.
Shindo does that synthesis. It reads Apple Health — whatever device wrote the data — computes readiness with the four drivers behind it, models training load per sport, and builds the week. When you miss sessions or swap a run for a ride, it counts what you actually absorbed and re-flows the block instead of leaving you with a plan for an athlete you no longer are.
The part I'd most like feedback on is the constraint I built it around: there's a language model in the app, and it is not allowed to do arithmetic. Every number is computed deterministically on-device first; the model receives finished numbers and writes sentences about them, and if its text disagrees with a computed value the computed value overwrites it. There's exactly one exception — the weekly plan, where the model may propose a week that a 19-rule validator then accepts or rejects against limits derived from your own data. If it rejects twice, you get the engine's own week and never see a failure.
The whole methodology is published, constants included: https://shindo-app.com/methodology
It's free for readiness, the plan, the load charts and workout detail. Pro adds the AI interpretation and the forward-looking models.
Honest limits, so nobody wastes a download: iPhone only, no Android, it can't push workouts to your watch, and it doesn't record sessions — it reads what your device already recorded. If you don't own something that tracks sleep and HRV, it has nothing to work with.
Happy to answer anything.
About Shindo Endurance Training on Product Hunt
“Your first triathlon, on the watch you already own”
Shindo Endurance Training was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #108 on the daily leaderboard. Getting into triathlon usually starts with a purchase — a thousand-dollar watch arrives before the first swim lesson does. Shindo takes the other side. Apple Health is the only way data gets in, so any watch that already records sleep, heart rate and workouts is enough. Swim, bike, run, brick and strength, with a race goal that works back from your start date. The plan is adaptive, not a calendar: miss a session or swap a run for a ride, and the week re-flows from where you are.
On the analytics side, Shindo Endurance Training competes within iOS, Health & Fitness and Sports — topics that collectively have 205.4k followers on Product Hunt. The dashboard above tracks how Shindo Endurance Training performed against the three products that launched closest to it on the same day.
Who hunted Shindo Endurance Training?
Shindo Endurance Training was hunted by Aleksandr Kolesnikov. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Shindo Endurance Training including community comment highlights and product details, visit the product overview.
Aleksandr Kolesnikov