Getting fitter requires pushing your body, but pushing too hard, too fast, or without adequate recovery is one of the most common causes of running injury and overtraining. Runna's plans are designed with injury risk mitigation in mind. Here's how.

Your weekly mileage and your long run are managed independently, and that's intentional. Your long run places a disproportionate demand on your body relative to the distance it adds to your weekly total.

Because of this, Runna manages it separately, applying its own build limit independent of your overall weekly mileage. This is designed to prevent your long run from increasing too quickly, even as the

rest of your training builds.

This aims to protect against both the immediate risk of a single session that's too long, and the longer-term risk of a long run that's building faster than your body can recover from week to week.

For New to Running, Return to Running, and Path to parkrun plans, your training load is designed to avoid jumping too far in a single week because two separate limits apply simultaneously, and whichever is more conservative applies.

Each week, your training ceiling is either a fixed increase on top of your current best, or a set multiple of your current best, whichever is smaller. This is designed to avoid a workout that is dramatically more demanding than you've managed before. Rapid jumps in training load are one of the most common causes of overuse injury in new runners, and this dual constraint is specifically designed to reduce that risk.

During your deload weeks, your harder sessions (intervals, tempo runs, and hill sessions) are reduced more significantly than your easy runs. This isn't just about running fewer kilometres; it's about recognising that hard sessions place a much greater physiological demand on your body than easy running does.

Reducing the distance of hard sessions during recovery weeks gives your body the chance to absorb the training you've done, reducing both injury and overtraining risk.

If you use the Not Feeling 100% feature to tell Runna you're unwell or not feeling yourself, your plan doesn't carry on building as normal. Both your mileage and your pace progression are paused for the duration of your adjustment period. Continuing to increase training load while your body is already under stress puts you at risk of injury or overtraining, which Runna aims to help you avoid.

If you're undertaking short, easy runs during this period, your session distances are also capped based on your ability level, making sure even your lighter runs stay within what's appropriate while you recover.

Whether you've taken a holiday or had time away from running, Runna doesn't just pick up where it left off. Your first week back includes a mileage cap to ease you back into training gradually.

If you've gone two or more weeks without a long run, your long run is specifically capped in your first week back too, because jumping straight back to your previous long run distance after time away is a common cause of injury.

Your Plan Won't Let You Add a Race Your Long Run Hasn't Built Toward

For both your goal race and any B-races you add, Runna is designed to prevent you from scheduling a race distance that your long run within your current plan cannot build toward before the race date. Racing a distance significantly beyond what you've trained for in your current plan is a meaningful injury risk.

For B-races, your long run is also reduced in the week beforehand, acting as a mini-taper. This is designed to help you arrive at your B-race without carrying unnecessary fatigue or physical stress that could increase your injury risk on race day.

If you're training six or seven days a week, you're already accumulating a high total training load. Runna accounts for this by applying a more conservative weekly build rate for higher-frequency runners, while aiming to ensure that runners training less frequently still make meaningful progress week-on-week. This is designed to prevent high-frequency runners from compounding an already significant weekly load with large week-on-week increases.

On non-distance plans, if you select Steady or Gradual as your build rate in Training Preferences, Runna reduces your weekly build rate accordingly. This lets you train at a lower overall stress level whether that's because you're managing a busy life, returning from a period of reduced training, or simply prefer a more gradual approach.

Your plan will still make progress every week, but at a pace that's more appropriate for where you are right now.

When your mileage reaches its ceiling on a non-distance plan, Runna introduces gentle variation into your weekly training rather than prescribing exactly the same load week after week.

Training at a fixed high load with no variation is a recognised risk factor for both overuse injury and the kind of mental fatigue that can lead to pushing beyond what's prescribed. This built-in variation is designed to keep things sustainable without meaningfully changing your overall training level.

Getting fitter requires pushing your body, but how you build matters as much as how hard you work. Every feature described here is designed with that balance in mind, aiming to give you a training experience that challenges you appropriately, week after week, without asking more than your body is ready for.