Mileage is always a big topic of discussion with runners, almost a badge of honor for some runners. For newer runners, the questions usually revolve around increasing mileage safely but quickly (sometimes just quickly) while with more advanced runners, the questions might be centered more around how much mileage is enough. What I’d like to do is offer up some thoughts on common “rules” and give you some ideas to think about when you start looking at your own training volume.

The most popular method of increasing mileage, by far, is the 10% rule

General Theory

The most popular method of increasing mileage, by far, is the 10% rule. A quick Google search on “increasing running mileage” will show you numerous articles. This has come under some criticism- just read those above mentioned articles. It certainly is a pretty conservative approach, especially with newbies and general low mileage runners. For instance, if you run 10 miles your first week of running, then this rule says that the most you can add is 1 mile. The practicality of that isn’t necessarily high. You might have a variance of 2-3 miles without even trying.

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Another theory comes from the ever famous Daniels Running Formula which Dr Daniels writes about adding no more than one mile per run per week. For instance, if you run 4 times per week, then add no more than 4 miles the next week. This proposal is seemingly scalable, as many competitive runners will run 10 plus runs in a week and that would probably be about a 10% increase in mileage. So, for lower mirage runners, the amount you can increase may be more like 15-20%. This makes sense because adding even a small amount of total weekly mileage in low volume runners will tend to be higher than the very conservative 10% rule.

What’s best way to approach? Well, for lower mileage runners the 10% rule is probably to conservative. To be honest, at that rate of increase, you’ll spend all summer just trying to get to a decent weekly volume. For higher mileage runners, there’s probably not going to be much difference between the two philosophies. And, for these folks, your concerns probably lie in other areas- which we will discuss later. The following are things that I would consider when deciding on your approach.  

Things to consider when discussing volume/mileage

Maximize your current level before making a jump. It takes 4-6 weeks for the body to adjust to a new training stress, so don’t jump to another training stress until you’ve gained what you can out of the current training stress. If you can still adapt at a lower training level, then why not? Otherwise, you have the risk of jumping up too much too quickly and getting injured.

One of the most common issues I see with beginning runners or runners trying to make a big jump in training is that they were feeling great and then, BOOM! They got a tendonitis or a stress fracture. What we tend to neglect is that our cardiorespiratory fitness can increase quite rapidly, within a couple weeks. However, things like bone and tendon take much longer to catch up. So, if we jump up too much, despite the increase in fitness, we end up sidelined. That is why I say to not really jump up a little bit every week, rather increase a moderate amount every 4ish weeks and then stay there. It won’t be as slow of a buildup as the 10% rule, but not so fast that the body can’t adjust. Running more mileage is only good if you can do it consistently!

2.  Focus on endurance before intensity: In general fitness we look at the acronym FITT which represents frequency of exercise, intensity of exercise, amount of time exercising, and type of exercise.  When we begin increasing mileage, we are potentially adjusting all four of these variables. If we add a day to our routine, we automatically are adding more time that we are engaging in a certain type of exerci...