Controls weekly load
Marathon training is checked for progression, recovery, and taper shape before the schedule reaches you.
Marathon
Marathon training needs more than a PDF.
Runapt manages the moving parts of a marathon block: long runs, weekly load, fatigue, missed sessions, routes, pacing, and plain-language feedback.
No credit card required · Free plan available forever
Product fit
- 12-18 week marathon plan structure
- CTL/ATL/TSB fatigue modeling and readiness adaptation
- Race prediction, pacing strategy, and post-run AI notes in Pro
VDOT
paces
AI
feedback
GPS
routes
How Runapt helps
Marathon Training App
Train for a marathon with adaptive long-run progression, VDOT paces, fatigue modeling, AI coach notes, routes, and race strategy.
Keeps long runs practical
Routes can start where you are and match the planned distance so execution is not another planning task.
Explains the why
Coach notes and adaptation rationale make changes understandable instead of mysterious.
How many weeks does marathon training take?
Most marathon blocks run 12 to 18 weeks, and the right length depends heavily on your existing weekly mileage rather than just your goal time. A runner already comfortable with 40-50 kilometers a week can often prepare in 12 to 14 weeks; someone building toward their first marathon from a lower base typically needs closer to 18 weeks so long-run distance and weekly volume can rise without a spike.
Runapt sets the block length from your current fitness and race date, so a first-time marathoner gets the runway a fixed 16-week template does not always allow.
Managing weekly load over a long block
A marathon block is long enough that small overreaches compound into real fatigue by the time race day arrives, which is why tracking training load, not just following a static schedule, matters more here than in shorter distances. Fatigue modeling that looks at accumulated training stress, often described as CTL, ATL, and TSB, can catch a build-up before it turns into an injury or a stalled taper.
Runapt checks weekly load and readiness continuously through a marathon block, adjusting future sessions when the numbers suggest you are absorbing training well or need a lighter week.
Preparing for marathon-specific fueling and pacing
Marathon pace feels sustainable for the first two-thirds of the race and much harder for the final third, which is why pacing discipline in the opening miles matters more here than in any shorter race. Long runs that include marathon-pace segments teach both the pace itself and the fueling rhythm you will need on race day.
Runapt’s VDOT-calibrated marathon pace and, in Pro, a race prediction and pacing strategy give you a specific target instead of a guess based on a recent shorter race.
What happens when training gets interrupted
A 12-to-18-week block almost always runs into at least one disrupted week, whether from travel, illness, or a bad training week, and how the plan responds to that disruption matters more than how it looks on paper before the block starts. Stacking missed long runs onto the next week or panicking and cutting volume too far are both common mistakes.
Runapt reshapes the remaining weeks automatically when a session is missed or readiness drops, keeping the block’s overall shape, base, build, peak, taper, intact instead of forcing you to redesign it yourself.
Start free, add Pro when you want more
You can build and follow a marathon training plan on Runapt’s free plan, with VDOT-based paces, automatic routes, and readiness-aware adjustments included. Pro adds fatigue modeling, race prediction, pacing strategy, and AI coach notes for runners who want deeper detail through a long block.
Either way, the plan starts from your current fitness and target race date, not a generic 16-week template.
FAQ
Is marathon training a Pro feature?
Yes. Longer race distances, deeper adaptation, fatigue modeling, and race strategy are part of Pro.
Can the plan change during taper?
Yes. Readiness and missed runs can still adjust the remaining sessions while preserving the taper purpose.
Can Runapt help me map out training for my first marathon?
Yes. Runapt maps out first marathon training from your current fitness, available days, race date, long-run progression, routes, and recovery signals.
How much weekly mileage do I need before starting a marathon block?
There is no single number, but arriving with a consistent base of at least 25-30 kilometers a week makes the build safer. Runapt calibrates the plan to whatever base you currently have rather than assuming a fixed starting point.
What is CTL, ATL, and TSB and why does it matter for a marathon?
They are measures of chronic and acute training load and the balance between them. Runapt Pro uses this fatigue model to flag when weekly load is rising faster than your body is likely adapting, which matters most over a long marathon block.
Can I run a marathon on 4 runs per week?
Yes, though the long run and one quality session become even more important when training days are limited. Runapt builds the plan around your available days rather than assuming a 5 or 6-day week.
Free
$0/month
No credit card. Free forever.
For starting structured training without committing to a race block.
- 5K and 10K plans
- Up to 2 training plans
- Standard GPS routes
- Run log and history
- Basic real-time pace tracking
- Achievements and streaks
Pro
$49/year
About $4.08/mo billed annually, which is cheaper than monthly. Prefer monthly? $7.99/mo. 14-day free trial.
For runners with a race on the calendar who need a plan that adjusts when life does.
- Founder price — locked in for life
- Everything in Free
- Unlimited training plans
- Half marathon and marathon plans
- Adaptive plan adjustments
- AI coach notes & chat
- Fatigue dashboard
- Race prediction and pacing strategy
- HealthKit and Apple Watch sync
Prices shown for your region. Your exact price is set by the App Store at checkout.
Start
Your next race block can start today.
Tell us your race. Get a plan calibrated to your fitness. Open your first route before your next run.
No credit card required · Free plan available forever · Cancel Pro anytime