Your old plan wants you back at your peak. Your tendons haven’t agreed to that yet. The best comeback app rebuilds from the fitness you have today, and none of TrainingPeaks, Garmin Coach or Runna documents a hard weekly cap for returners.
That gap matters. After weeks off, the number on your watch says one thing and your body says another. Here is how five platforms handle it, and how to protect yourself whichever you choose.
Why Most Apps Get the Comeback Wrong
Most apps assume you are a healthy athlete on a steady path. A layoff breaks that assumption. Your plan keeps moving forward while you sit on the couch.
Think of a frayed rope. It looks fine until someone hangs a heavy load on it. Muscle recovers fast. Tendon and bone adapt slowly. Your fitness can feel back long before the tissue is ready.
A static plan can’t see that. It hands you week 9 of a block when you only did week 1 of a rebuild.
In short: a good comeback app starts from where you are, not where you were.
What the Ramp-Rate Evidence Says
Start with a warning. Every “safe ramp” number below is a heuristic. None is a clinical rule for injury return. Your physio or doctor decides when you run, ride or swim again.
Joe Friel at TrainingPeaks suggests a weekly rise of about 5 to 8 fitness points suits most healthy athletes. He calls anything above that “crash training load.” His article doesn’t address injury return. Suunto advises 2 to 5 points per week for people returning from a break or injury. That is a vendor recommendation, not clinical evidence.
Translation: one week of fitness-building should feel small after a layoff.
What about the research? Nielsen and colleagues tracked 874 novice runners. Overall injury rates didn’t differ by how fast weekly distance grew. Runners who jumped more than 30% had a hazard ratio of 1.59 for distance-related injuries like patellofemoral pain. The confidence interval was 0.96 to 2.66, so it is suggestive, not proven. The authors advised staying under 30% per week.
In plain words: big jumps look risky, but the proof is soft.
The ACWR debate
You may see the acute:chronic workload ratio, or ACWR. It compares your last week of training to your last month. A 2025 meta-analysis of 22 studies found the lowest injury incidence at a ratio of 0.8 to 1.3. The pooled estimate was 56%, with a confidence interval of 0.14 to 0.94. That is too wide to call a threshold.
Gabbett’s 2016 paper made a useful point. Athletes with high chronic loads got fewer injuries than those with low ones. The problem is a spike relative to your base, not training itself.
Then came the critics. Impellizzeri and colleagues argue the ratio is mathematically coupled, since this week sits inside the month. They say current evidence is too weak to prescribe load changes for injury prevention. They suggest progressive overload, clinical experience and athlete response instead.
Treat 1.3 as a conversation starter. Don’t treat it as a fence.
Best Training App for Injured Athletes: Platform Comparison
Here is what each platform documents today. Entries about forum complaints are user reports, not company statements.
| Platform | Injury or time-off feature | Hard ramp cap documented? | Sports |
|---|---|---|---|
| TrainingPeaks | Static “Return to Running” plans in its plan store | No | Multisport |
| Garmin Coach + Connect+ | “Pause training status” turns off recommendations | No | Mostly running and cycling |
| Runna | Post-injury plan; start one ability level lower, two after a stress fracture | Not as a number | Running |
| TrainerRoad | Injury or illness “Training Adjustment” re-plans and restarts at a lower level | Not as a number | Cycling |
| AthleteOS | Builds the plan around your current fitness | No fixed number | Multisport |
TrainingPeaks
TrainingPeaks is the data standard. Its Performance Management Chart shows your fitness score (what TrainingPeaks calls CTL) rising and falling. Its store sells return-to-running plans, including a 12-week physical-therapist-prescribed option. Those plans are static. They start from a generic level, not your post-layoff fitness.
Garmin Coach and Connect+
Garmin lets you pause training status for injury or illness. You can keep recording, but recommendations stop until you resume. Garmin’s docs don’t describe a rebuild. They also don’t say how a pause affects a Coach plan. User reports on Garmin forums say missed Coach workouts can’t be rescheduled and the plan keeps moving. Some threads are years old, so check in the app. Garmin’s page for Connect+ lists no injury-return control.
Runna
Runna’s guidance is the most specific. Get physio or doctor approval, start at least one ability level below your current one, and go two levels lower after a stress fracture. Skip race planning for now. It suggests 16 or more weeks of build before a major race. Runna covers running only.
TrainerRoad
For cyclists, TrainerRoad lets you log an Injury, Illness or Time Off adjustment, and Adaptive Training re-plans around it. After time off, it starts at a lower progression level. Its blog notes most athletes need at least 15 days off before muscular endurance drops. Some users report workouts get removed but the re-entry isn’t gentle. Cycling only.
AthleteOS
AthleteOS builds your training plan around your current fitness, then adapts day to day from your training and recovery data. It doesn’t resume a paused plan at your old peak. It also doesn’t promise to prevent injury, and it can’t replace your clinician. See how it builds your plan.
How to Rebuild Safely in Any App
Take Priya, 41, a half-marathoner. A calf strain cost her five weeks. Her old plan wanted 30 miles in week one back. Her physio cleared walk-run work. She started at 12 miles, then added small amounts each week for eight weeks. She reached 28 miles, holding one week when her calf felt tight.
Here is her stylized rebuild. The numbers are an example, not a prescription.
| Week | Weekly miles | Long run | Notes |
|---|---|---|---|
| 1 | 12 | 3 | Walk-run only, all easy |
| 2 | 14 | 4 | Same pattern, no hills |
| 3 | 16 | 5 | First continuous easy run |
| 4 | 16 | 5 | Held a week after calf tightness |
| 5 | 19 | 6 | Calf quiet, load resumed |
| 6 | 22 | 7 | Added light strides |
| 7 | 25 | 8 | Still no hard workouts |
| 8 | 28 | 10 | First tempo block approved |
Notice week 4. She didn’t push through tightness. She held steady and the calf settled. That one pause kept the whole plan on track.
Her rules work for anyone:
- Get clearance first.
- Start from today’s fitness.
- Add load slowly, then hold a week if anything flares.
- Keep intensity out until volume feels boring.
- Watch recovery data, like a 7-day HRV trend.
Steady beats heroic.
For the full protocol, read how to return to training after an injury. To see how training load builds and fades, read how fitness and fatigue scores work. You can also compare this list with our guide to apps for masters athletes.
The Pick
Choose Runna if you only run and want clear post-injury steps. Choose TrainerRoad if you only ride. Choose TrainingPeaks if you have a coach who can set the numbers. Choose AthleteOS if you want one plan that rebuilds from your current fitness across sports.
No app can feel your calf for you. Your body sets the pace. The app should listen.