Building Run Volume Safely
Small increases and easy effort will take you much further than big jumps.
Once easy running starts to feel comfortable, the next step is to gradually build how much running you do each week.
The key word is gradually.
Your cardiovascular fitness can improve quite quickly, but your muscles, tendons and joints often take longer to adapt to the extra impact of running. Adding too much distance too soon can leave you overly tired, sore or unable to train consistently.
Add a little at a time
A common guideline is to increase your weekly running volume by around 5–10% at a time.
This is not an exact rule, and some beginners may need to progress more slowly. For example, if you currently run 10 kilometres in a week, adding around 0.5–1 kilometre the following week may be enough.
You do not need to increase your distance every week. If your current training still feels challenging, simply repeat the same week.
Increase one thing at a time
Try not to increase distance, speed and frequency all at once.
If you are making your runs longer, keep most of them at an easy RPE 3–4. Once your body has adjusted to the extra distance, you can gradually introduce slightly harder efforts.
For beginner triathletes, two consistent runs each week can be enough to make good progress alongside your swimming and cycling.
Use run-walk when needed
Walking breaks can be useful when increasing distance. A short walk can bring your breathing and heart rate back under control while allowing you to continue moving.
There is no prize for running every step in training.
Listen to your body
Some tiredness after training is normal, but pain that gets worse while running or continues between sessions is a sign to back off.
Do not be afraid to shorten a run, repeat a training week or take an additional rest day.
Consistency beats big jumps
The aim is not to see how quickly you can increase your mileage. It is to build enough fitness to keep training week after week. This is the key message — consistency wins over intermittent training.
Small increases, easy running and good recovery will usually take you much further than making big jumps and then needing time off.
The key takeaway
Build slowly, stay consistent and give your body time to adapt.
Keep exploring
Find more running advice in the Running section, including tips on brick runs, run-walk strategy and easy-pace running.