There’s a strange confidence that grows after you’ve been in the sport for a while. Even when life gets busy or an injury forces you to step back, you know you’re not starting from zero. You might lose sharpness, sure, but the foundation doesn’t disappear overnight. I’ve had stretches of training where running wasn’t the main focus at all—sometimes by choice, sometimes because that’s just what life allowed—and those periods taught me a lot about what really matters when your mileage dips.
Running only a handful of miles a week comes with its own challenges. Your legs aren’t used to the impact, the movement feels different, and pace becomes more effortful than you remember. Those short runs felt harder than “normal” for me, simply because my body had to get used to the pounding again. Running is funny like that: too little or too much of it can both put you in a fragile spot. Either way, intensity needs to be handled with care.
Still, when I returned to racing, I was surprised by how well my fitness held up. And that’s the first thing worth pointing out.
We don’t lose fitness overnight. If you stay active, you hang on to a lot more than you think. You might not peak or run a personal best with very little training, but you’ll be surprised by how well you can still perform.
The endurance work I did—mostly cycling—kept my engine strong. Cycling isn’t specific to running, of course, but it helps a ton. It builds the aerobic base you need to handle effort. What it doesn’t do is condition your legs for running. The pounding is different. The mechanics are different. The way fatigue settles into your legs is different. So even with a strong engine, you still need some running to prepare your body for the movement itself.
When I increased my mileage to 25 miles two weeks before my race, my body handled it well. I’ve done plenty of weeks far above that in the past, which matters. It wasn’t brand-new territory, just something I hadn’t touched in a while. Still, my legs felt heavy by the end of the week. That’s normal. It was simply my body remembering what consistent running feels like.
The biggest mistake I see when people try to build fitness with low mileage is trying to do too much too quickly. That’s usually how injuries happen. Your body needs time. Yes, people love to bring up the 10% rule, but the truth is everyone is different. Age, previous training, lifestyle, work stress, sleep, and family responsibilities all play a part in how much you can increase at once. Some people handle big jumps. Others don’t. For the long term, it’s better to move forward with caution. Let adaptation happen.
As far as how much you “need” to run—there’s no magic number. It depends entirely on your goals. But I also think it’s healthy to take real time off from the sport. It gives you a chance to miss it again, to want to train, to feel excited for the next race rather than forcing it. Running is personal. You’re not doing this for glory. You’re doing it to become a better version of yourself.
If you’re in a phase where running is low, don’t panic. You can maintain a surprising level of fitness through other activities. Just make sure that when you do run, you’re controlled, intentional, and giving your body the space it needs to adjust. With a strong aerobic base and a little patience, you’ll come back faster than you expect.