A 16–24 week marathon training plan that adjusts itself every week based on your actual runs, missed sessions, and recovery data. The coaching intelligence that was previously only available to elite runners — now accessible to everyone.
A traditional marathon training plan is a fixed 16–20 week schedule that assumes you'll complete every session as written. Life doesn't work that way — and neither should your coaching.
An AI marathon coach is different in four fundamental ways:
When you start with PacecraftAI, a conversational onboarding asks for your goal time, race date, current weekly mileage, and preferred training days. From those inputs it builds a periodised 16–24 week plan — base, build, peak, taper phases — with specific sessions for each day.
After that, the AI coach monitors your training continuously:
| Feature | Generic Plan | Human Coach | AI Coach (Pacecraft) |
|---|---|---|---|
| Adapts when you miss sessions | ✗ | Sometimes | ✓ Every week |
| Responds to your questions | ✗ | ✓ (scheduled) | ✓ 24/7 |
| ACWR / injury risk monitoring | ✗ | Manual | ✓ Automatic |
| Taper based on real fatigue | ✗ | Sometimes | ✓ |
| Remembers your injury history | ✗ | ✓ | ✓ |
| Available 24/7 | ✓ (PDF) | ✗ | ✓ |
| Monthly cost | Free | $150–$500 | Free to start |
Building to 42km for the first time is full of unknowns. AI coaching answers every question — long run nutrition, pacing zones, what to do when a session feels terrible — with your specific training context.
The recreational marathon range where training quality matters most. Adaptive periodisation and weekly load monitoring are what turn consistent training into a PB.
When your week changes, the plan changes. No more falling behind a static schedule and trying to cram missed sessions into the weekend.
ACWR monitoring and biometric data integration catch the early warning signs — elevated resting HR, poor HRV, rising perceived effort at controlled pace — before they become DNS situations.
PacecraftAI builds your marathon plan from your race date backwards, adapts every week based on real training data, and answers your questions 24/7. Free to start — no card needed.
Get your AI marathon coach →The long run is the cornerstone of marathon training. PacecraftAI builds your long run from your current comfortable distance to 32–35 km in the peak week, following a structured 3-week build / 1-week recovery pattern. When a long run goes badly — heart rate spiked, faded in the final third, needed to cut short — the AI adjusts the next long run target rather than blindly continuing the ramp.
Most generic plans reduce mileage by a fixed percentage over a fixed 3-week taper. AI coaching calculates your taper timing based on your actual Training Stress Balance — the difference between your chronic training load (fitness) and your acute training load (fatigue). The result is a taper that delivers maximum freshness on race day rather than one calibrated to an imaginary runner.
In the final two weeks before your marathon, your AI coach works with you on a specific race-day pacing plan: target pace per km, when to bank time, when to hold back, and how to manage the critical km 32–42 stretch. Use our marathon pace calculator to convert your goal time into exact per-km splits.
PacecraftAI builds your 16–24 week marathon plan from your race date backwards — adapting every week based on how training is actually going. Free to start, available on web, Android, and Telegram.
Get your marathon plan free →