Marathon Training Over 40: What Changes and How to Run Your Best as a Masters Runner
I coach a lot of runners over 40. One of the first things they say to me is something like, "I feel like I'm doing everything I used to do, but I keep getting hurt" or "I'm training just as hard and my times are going the wrong direction."
That's not a motivation problem. It's a physiology problem. And once you understand what's actually happening in your body after 40, training starts to make a lot more sense.
What Actually Changes
Three things shift in ways that matter most for runners: recovery time, how fast your connective tissue adapts, and VO2max.
Recovery slows down. Muscle repair after hard efforts takes longer as you get older. The window between "I'm recovered" and "I'm not" gets tighter. A hard tempo on Tuesday might not have you ready to go again until Thursday or Friday. If you try to squeeze another quality session in on Wednesday, you're training on a body that hasn't finished processing the last workout. That's usually where the overuse injuries come from.
Connective tissue adapts more slowly than your cardiovascular system does. Your lungs and heart can be ready for 20-mile long runs before your Achilles or IT band can handle the load. That gap is why masters runners tend to pick up tendon problems when they try to build mileage too fast. The cardio feels fine. The tendons don't.
VO2max does drop with age, roughly 1% per year after 25. But that number is highly trainable. Masters runners who keep intensity in their programs see a much slower decline than those who drop all their hard work and just run easy miles.
How to Adjust
Cut a training day before you cut volume. Going from six days a week to five and keeping those five days high quality is a better trade than trying to cram everything into six days and not recovering between them. That extra day off matters more now than it did at 30.
Take your warm-up seriously. Not just starting slow, but actually doing 5-10 minutes of activation work before you run. Hip circles, leg swings, glute activation. It sounds tedious and it's genuinely worth it. Add regular strength work targeting the hips, glutes, and single-leg stability and you'll deal with significantly fewer injuries. That's not a maybe. It's consistent across the runners I've worked with.
Keep the hard work in your program. This is the mistake I see most often. Runners over 40 drop all their intensity because it feels harder to recover from, and then wonder why their times keep dropping. You need to be smarter about recovery, yes. But one quality workout per week, a solid tempo or some marathon-pace miles, goes a long way toward keeping your fitness sharp.
Take your easy days seriously in the other direction. They need to actually be easy. Sleep is the best recovery tool you have. Eating in the first 30-60 minutes after a hard workout matters more now than it did when you were younger. Easy days aren't just "not hard." They're a specific training stimulus that needs to be protected.
What's Actually Possible After 40
My athletes over 40 qualify for Boston. They set half marathon PRs. Some of them run their fastest 10Ks. The ceiling is not where most people assume it is. The runners who get there aren't working harder. They're working smarter and paying more attention to what their body is actually telling them.
If you're a masters runner getting ready for a fall race and want to talk through what your training should look like, reach out for a free 15-minute consultation. The conversation costs nothing.
Coach Justin
