Less second-guessing. More course until race day.

The endurance companion for runners, trail athletes, and triathletes who want progress without sacrificing real life.

The exact session to do today

No more guessing between push and recover. A clear call grounded in your goal and how you actually feel.

  • Race goal
  • Load and recovery
  • This week's constraints
  • One clear decision

A plan that survives real life

A packed week or a missed session no longer breaks everything. Kaern reorganizes what comes next to protect what matters before race day.

  • Daily adjustments
  • Major / secondary priorities
  • Key sessions protected
  • Progress without guilt

Your data, put to work

Connect Polar, Strava, or import FIT files. Kaern turns history into concrete decisions — not another dashboard.

  • Polar & Strava
  • FIT import
  • Volume and load
  • Actionable trends

Ready in three minutes

How it works

1

Connect your training

Polar, Strava, or FIT files — Kaern builds your training context right away.

2

Set your race

Peak race, key races, and prep — your season is clear, your plan has a direction.

3

Get your upcoming sessions

What to do next — adjusted to your form, your week, and real life.

Endurance is won over months — not one perfect week. Kaern keeps the course when the plan has to move.

— Why Kaern exists
  • Polar & Strava connected
  • Built for running, trail & triathlon
  • Early-bird + beta priority for waitlist members
Kaern

Inspired by the cairn — the marker that guides you on the trail.

You aim for the race. Kaern keeps the course.

Kaern doesn’t run for you. It tells you what to do next — especially when things don’t go to plan.

Kaern is the personal coach for endurance athletes. Where apps show numbers or force a PDF plan, Kaern adjusts your path every day based on your schedule, recovery, and progress — with AI, so high-level coaching is always within reach.
  • You choose the race and the ambition.
  • Kaern adjusts the path, session by session.
  • Confidence — no dead plan that ignores your fatigue.
  • Consistency over months — not one perfect week, then a crash.
Our story

What Kaern does for you

From watch sync to today’s session — everything to progress without getting lost

Connect your data

Polar, Strava, or FIT files — Kaern understands where you’re starting from.

Race goals

Your next race becomes the heading. Kaern organizes the season: peak, key, and prep.

Daily coach

Fatigue, long runs, race readiness — a clear answer grounded in your metrics.

Adaptive plans

Structured training that adjusts mid-week — not three weeks too late.

FAQ

Short answers before you join.

Early access signup and launch updates are free. At launch, early-bird pricing is reserved for waitlist members. We’ll tell you before any billing starts.

Yes and no — it depends what you’re looking for. Kaern doesn’t always replace a human eye, but it uses your data to adjust to your activity and daily life: sessions, fatigue, curveballs, and what to do next.

A fixed plan follows the calendar. Kaern answers a different question: what to do today when fatigue, work, or a missed session changes things — without guilt-trip catch-up.

Polar and Strava are live today, plus FIT import. Garmin, Coros, and Suunto are next — tell us your device and we’ll notify you when it’s ready.

Claim your priority access

Join for beta priority and early-bird pricing at launch — no spam, we only write when it matters.

Get priority access