How to Avoid Injuries When Using Runna Training Programs

Runna is one of the most talked-about training apps in the running community, and Strava’s acquisition of the platform earlier this year only cemented its status as a go-to tool for runners seeking structured training without hiring a coach. However, not all reviews have been positive lately. On Reddit andTikTok , runners are blaming virtual coaches and algorithmic training programs for shin pain, stress fractures, and various running injuries. Some specifically accuse Runna of pushing runners too hard .

The thing is, Runna isn’t the only cause of problems. Running injuries are extremely common. Research consistently shows that 27 to 52% of runners suffer at least one injury per year, usually due to overuse. At the same time, people often make the mistake of blindly trusting app-based training plans. Here’s what you need to know to avoid injuries and stay fit.

Understand the logic of the training plan (and make any necessary adjustments).

I’ve previously written about how to choose and trust a training plan, and I’ve also recommended completely free and widely recognized resources ( like Hal Higdon’s website ). When I have a race coming up, I need to understand why my plan works the way it does. It’s important for me to understand the logic behind my mileage so I can always listen to my body and make informed decisions as I progress through my training.

In this regard, I think the Runna app is truly great —it creates personalized training plans, adapts to your fitness level, and makes structured workouts accessible to people who previously had no idea where to start. But if you follow the app’s training plan without listening to your body, the app won’t prevent you from overexerting yourself. This means you’re always the last line of defense—and with any training plan, that responsibility doesn’t disappear just because an all-knowing algorithm has created your schedule. On social media, this seems particularly risky for two groups of runners:

• Beginners who don’t have the experience to recognize warning signs. When you’re just starting a structured workout, it can be difficult to distinguish between normal muscle soreness and something more serious. The enthusiasm associated with having a plan can drown out the more subtle signals your body is sending.

• Beginner bloggers and highly motivated runners who have built their reputation on consistency and goal achievement. For this group, rest days and missed workouts are perceived as failures.

If you understand the logic behind your runs, you can adapt your plan to your needs over time. My problem with programs like Runna is that some runners don’t demonstrate sufficient wisdom and skepticism about their use of the app.

Look out for these warning signs in any training plan.

To be honest, Runna’s standard training plans aren’t exactly conservative. They’re designed for results, which typically means a progressive approach—gradually increasing mileage and intensity week after week. For a runner who’s already built a solid base, this is fine. But for a runner who’s overestimated their current fitness or is returning from a break, the standard settings may be too aggressive.

What to pay attention to:

• Increasing mileage by more than 10% week to week. This isn’t a hard and fast rule, but from personal experience, it works. Generally, you should never increase mileage by more than 10% week to week. If your training plan requires you to exceed this amount, pay close attention to how your body responds.

• Two intense workouts in a row. If you’re not recovering well between intense workouts, this is a sign you should pay attention to.

• Not enough easy walking. Many runners using Runna, especially those just starting structured training, end up running too much of their distance at moderate effort, rather than at easy walking pace. Easy walking really does mean easy: you should be able to hold a full conversation. If your “easy” runs feel like real work, slow down, even if your pace targets say otherwise.

Luckily, Runna lets you adjust the intensity of your workout. Open the “Plan” tab in the app, go to “Manage Plan,” and select “Workout Settings,” as described here .

Always look out for these signs of injury when running.

This is a non-negotiable list. No plan—AI-generated or not—is worth testing in practice:

• Sharp or localized pain while running. A little soreness is normal, but pain in a specific spot that gets worse as you run is not.

• Pain that changes your gait. If you limp, compensate for pain, or noticeably favor one side of your body, your body is asking you to stop using the only language it knows.

• Pain that is worse the morning after an intense workout than during a run. Post-run soreness is typical, peaking 24–48 hours later. Pain that is worse the next morning than mid-run may be a warning sign.

• Bone pain upon impact. Any deep pain localized to a bone (shin, foot, thigh) and occurring specifically when the foot strikes the ground may require serious medical attention. Stress fractures are devastating news, and they are all too common in people who increase their mileage too quickly.

• Persistent joint pain. Knee, hip, and ankle pain that occurs repeatedly, even on easy days, indicates that your training load is exceeding your current recovery capacity.

If any of these symptoms occur, the correct decision is to continue the session and re-evaluate. The correct decision is to stop, rest, and if the symptom persists, consult a doctor.

This is the best way to use Runna.

Ultimately, think of Runna like a GPS navigator: a great navigation tool that nonetheless requires the driver to pay attention to the road. Here’s a practical diagram:

1. Be honest about your starting level. Runna can only work with the information you provide. If you inflate your current weekly mileage or recent race results, you’ll get a plan that assumes a fitness level you don’t have.

2. Think of the first two weeks as a test. Are easy runs truly effortless? Are you recovering well between workouts? Does the total weekly training volume seem challenging but doable, or does it immediately feel overwhelming? Adjust the intensity as you go.

3. Use the “Workout Preferences” settings. If you’re having trouble, reduce the intensity.

4. Incorporate recovery weeks into your training plan intentionally. Good training plans include scheduled “rest weeks” with reduced mileage for adaptation. Make sure your Runna plan includes these weeks, and if you feel exhausted before one, consider it mandatory rather than optional.

5. On easy days, run really easy. Again, most runners run too hard on easy days. Try running slower than you think you need to .

6. Take rest days. It’s important to remember that adaptation occurs during recovery, not during the race itself.

The criticism that Runna allegedly causes injuries isn’t entirely unfounded, but it’s also not entirely fair. Injuries are common in running. If you think about it, any tool that helps people train harder will statistically correlate with an increase in injuries. Good, intense training is inherently risky. However, this risk is manageable. To manage it, you need to maintain control while remaining a bit skeptical of any resource. You need to be able to honestly assess your fitness, listen carefully to your body’s signals, and be willing to adjust your plan rather than blindly follow it.

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