AI running coach

An AI running coach that adapts to every run.

Grit builds your race plan from real benchmarks, reads your pace and heart rate after each run, and proposes the next adjustment in one tap — with strength and mobility built in so you get to the start line healthy.

Join the waitlistHow it works

Static running plans don't survive contact with real life

A printed marathon plan assumes every week goes perfectly. Miss a few runs to a head cold, a work trip, or a bad night's sleep and the targets for next week are already wrong. Progressing faster than the template expected? It can't push you. A plan that never changes can't coach you.

Gritty is an AI running coach app built around a coach named Grit. Grit drafts a full periodized block from your goal, then watches what you actually do — pace, splits, heart-rate zones, how the session felt — and adjusts the rest of the plan after every run. You approve each change; nothing happens behind your back. Want to steer it yourself? Ask Grit for guidance any time, and track every run, metric, and trend in one place.

How Grit coaches your running

Paces from your real benchmarks

Grit derives your easy, tempo, threshold, and interval paces from a recent race time or threshold effort — not generic tables — then recalibrates as your fitness changes.

A review after every run

Grit reads your splits, HR distribution, and how the run lined up with the plan, then writes a short review. Ran the tempo too hard? It says so and adjusts.

Strength and mobility built in

Your block isn't just runs. Grit schedules supporting strength and mobility work to keep your hips, calves, and knees healthy through the build.

Periodized to your race date

Base, build, peak, and taper phases are sized to the weeks you actually have, with long runs, intervals, and recovery laid out across the cycle.

You stay in control

Going on vacation, fighting a cold, or feeling strong enough to push? Tell Grit and it reworks your block for you — shifting long runs, easing you back in, or adding load. Every change is a proposal you approve.

Record or import any run

Track outdoor runs with phone GPS and a Bluetooth HR strap, or import from Apple Health and Health Connect (Coros, Suunto), or GPX/TCX/FIT files exported from Garmin Connect and other watches.
Chat with Grit drafting a 14-week half-marathon running plan, ending in a program proposal card.
Build your plan
Tell Grit your race and date. It drafts the full block.
Grit proposing a +10s/km bump on Tuesday's threshold intervals after a tempo run's heart rate showed it was too easy.
Adapt after each run
Tempo felt easy? Grit checks the HR and proposes a faster session.
A Saturday long-run review from Grit summarising distance, splits, and HR zones with quick-reply chips.
Review every session
Effort, splits, HR zones — plus quick replies to keep talking.

Everything a running app should do — plus the coach

GPS + heart rate

Route maps for every outdoor run and pairing to any Bluetooth HR strap — no watch required.

Import your history

Pull in past runs from Apple Health, Health Connect, or files so Grit knows your real training history.

Benchmark-driven paces

Training zones come from your numbers and update as you get faster.

Race periodization

Base → build → peak → taper, sized to the weeks before your event.

Runner's strength work

Supporting strength and mobility scheduled into the plan to keep you injury-free.

Free to start

Full coach, a complete program, recording, and imports cost nothing.

AI running coach — FAQ

Is this a replacement for a human running coach?
Grit handles the day-to-day work of a coach — building a periodized plan, setting paces from your benchmarks, reviewing each run, and adjusting what's next — for a fraction of the cost and available 24/7. It is a coach, not a medical professional, and it never silently changes your plan: every adjustment is a proposal you approve.
What race distances does it plan for?
Anything from a 5K to a marathon or ultra. You tell Grit the goal and date in plain language ("sub-2 half in 14 weeks"), and it sizes the block — base, build, peak, taper — to fit your weeks and current fitness.
Do I need a Garmin or smartwatch?
No. You can record runs with your phone's GPS and an optional Bluetooth heart-rate strap. If you do use a watch, import runs from Apple Health or Health Connect (Coros, Suunto, etc.) — or export a GPX/TCX/FIT file from Garmin Connect and upload it — so Grit reviews them in context.
How does it set my paces?
From your benchmarks. Grit asks for a recent race time or threshold effort during intake and derives your training paces and heart-rate zones from it, then recalibrates as your real sessions come in.
Does it include strength training for runners?
Yes — that's the point of a holistic plan. A running block includes supporting strength and mobility work to keep you healthy through the build, not just a list of runs.
Is it free?
Yes. The coach, a full running program, GPS recording, and imports are all free. Premium (€7.99/month or €69/year) adds unlimited chat, a review on every run, multiple programs, and deeper analytics.

Get a running coach that actually watches your training

Join the waitlist and be among the first to train with Grit when Gritty Fitness launches on iOS and Android.

Join the waitlist