Why Your Marathon Training Has Stopped Working (And How To Fix It)
WHY YOUR MARATHON TRAINING HAS STALLED
Your marathon training has stopped working, and the thing you did about it is probably the reason it has not started again. The paces have gone flat, your legs feel heavy on easy days, and the sessions you used to nail now fall apart halfway through. The obvious answer looks like more work: more kilometres, another session, one more hard day. That instinct is exactly what turns a short flat spot into a real marathon training plateau.
Steve Magness makes the case in The Science of Running that a plateau is almost never a motivation problem, and it is almost never lost fitness. It is stress that has built up faster than it can clear, or progression that moved faster than your body could absorb. Your fitness is still being built. It is sitting underneath a layer of fatigue that nothing in your plan ever accounted for.
It usually falls apart in three places. First, your stress keeps stacking. Training stress and life stress land in the same bucket, and your body cannot tell them apart. A tough month at work, broken sleep or a sick kid at home all hit the same system your long run hits, so the week your plan calls easy is not easy at all. Second, you jumped too soon. The moment a week felt manageable, you added to it, but adaptation happens in the weeks after the work, not during it. Third, you trusted numbers that looked fine.
THE DANGEROUS LIE YOUR WATCH TELLS YOU
Your resting heart rate is steady. Your recovery score is green. Your watch says you are ready, so you do the logical thing and add more. The problem is that the number you trust most can improve at the exact moment your body is in the most trouble.
A 2015 study published by the Public Library of Science followed 31 experienced male triathletes, 21 in an overload group and 10 in a control group, and tested them before a heavy training block, straight after it, and again after a two week taper. Ten of the overload group tipped into functional overreaching. Their performance dropped by about 2% and their fatigue was high, which is what you would expect. The surprise was that heart rate recovery in that same overreached group got around eight beats per minute faster. That was not a body recovering better. It was a flattened system that could no longer mount a proper response, and on a watch it looks identical to improved fitness.
I coached a midpack marathon runner through exactly this last year. His watch said his recovery had never been better, while his half marathon time had gone backwards by 90 seconds. He wanted to add a second quality session because every number he could see said he could handle it. That is precisely when this problem shows up, and precisely when you are most likely to make it worse.
HOW TO PROPERLY RESET YOUR TRAINING
Fitness is not made by the work. It is made by what your body does with the work afterwards. That is the positive case for backing off. A planned reduction is the only thing that lets the fitness you have already paid for actually surface, and it is why a runner who does less for two weeks often runs faster in week three than the runner who grinds straight through.
Start with a proper reset week. It is not a rest week and it is not a week off. Every 5 to 6 weeks, cut your training volume by 20 to 30% and hold your intensity and frequency exactly where they are. Cut all three and you lose the benefit, which is how most down weeks get wasted. You will know it is working when the session you dreaded last month starts to feel ordinary.
Next, stop jumping early. A week that finally feels manageable is not permission to add more. It is the first week that actually counted. Repeat that exact week three times before you change a single number. If the third repeat feels easier than the first, you are ready to build. If it does not, you have your answer.
Finally, rank your evidence in this order every time: how you perform first, how you feel second, and the recovery number on your wrist dead last. Trust the two that can hurt your feelings, never the one that flatters you.
YOUR TWO WEEK ACTION PLAN
Here is exactly what the next two weeks look like. Starting with your next run, cut your weekly volume in half, so a 60 km week becomes 30 km. Keep the same number of runs and keep your one quality session exactly as written, at exactly the same pace. If that session is a threshold effort, run it at your 10 km pace and not one second faster, with 10 minutes of easy running before and after.
Every other run across those two weeks is conversational, which means you can speak in full sentences out loud without gasping. At the end of the 14 days, go back to your old volume for one full week and add nothing to it. If that week feels easier than it did three weeks ago, the reset worked and you have earned the right to start building again.
Your easy runs will feel easy again, and that is the first signal every time. Your long runs stop being something you survive and go back to being something you build with. On race day, you get the last 10 km back because you arrive with your fitness available instead of buried. Your marathon training did not stop working because you went too soft. It stopped working because it worked, and nothing in your plan gave your body room to let it show.
If you want help reading your own training and knowing when to push and when to back off, personalised coaching with Run The Race is built for exactly that. You can also send a question through Ask The Coach.