Why runners stop improving — and what actually works

Why the same week stops working

Your body only changes when you ask it to do something it cannot yet do comfortably.

Do the same five runs, the same route, the same effort, month after month, and there is nothing left to respond to. You are fit enough for that week. The week has stopped being training.

The answer is not simply more. It is one thing different at a time. A longer run. A session at a pace you cannot hold easily. One extra run in the week. The rest stays where it is.

How fast you can add

Build gradually because it lasts — not because it keeps you safe.

Everyone has heard the 10 % rule: never add more than a tenth to your weekly distance. It sounds careful. It has been tested.

Progression rate still matters. Runners who added more than about 30 % to their weekly distance over two weeks had more of certain injuries ². A later study on half-marathon training did not find a clear link ³.

Here is the part nobody says out loud. Somewhere between a quarter and a third of recreational runners get injured during a training block anyway ⁴. Pretending a rule protects you sets you up to feel betrayed by your own body.

About that ratio on your app

The workload ratio does not do what the green zone says it does.

If you have used a training platform in the last ten years you have seen it: a number, and a coloured “sweet spot”. Sports scientists have pulled it apart. It is mathematically tangled with its own denominator, it produces patterns that look like findings but are not, and it does not support the decisions people make with it ⁵.

What does work is older and duller. Write down what you did and how hard it felt. Effort score times minutes tells you what your body actually did, rather than what the plan asked for ⁶.

Recovery is training, not a pause in it

Three or four weeks of building, then an easier one. That is standard practice. It is a convention, not a tested protocol — nobody has compared cycle lengths head to head.

It exists because the alternative is well documented. Keep loading without relief and you end up in a state that takes weeks to months to come out of ⁷.

The two things that genuinely help are unglamorous. Sleep has the best evidence of any recovery method ⁸. And honest self-report, collected the same way every time, beats most of the monitoring people pay for ⁹.

The taper, and what it is worth

Cut the volume before a race, keep the intensity, and you gain a few per cent.

That is one of the better-measured effects in endurance training ¹¹. A few per cent on a three-and-a-half-hour marathon is several minutes.

It is also the one part of the plan where doing less is definitely right. And the part people most often ruin by adding one last reassuring session.

Questions people actually ask