The basics (what actually matters)
Evidence: strong
Run a lot, mostly easy. Sleep well. Eat a balanced diet without badly over- or under-fuelling. Be consistent. Almost everything else is the last few per cent.
For most runners, the great majority of the available improvement comes from a handful of unglamorous things done consistently. Run as much as you comfortably can, mostly easy. Sleep well. Eat a balanced diet, taking care not to badly over- or under-fuel. Do that for long enough and almost everything else is detail.
The 95% that drives results for most people:
- Volume, mostly easy. Total training volume is the variable most consistently linked to distance performance, and most of it should be easy enough to sustain (training volume versus intensity; base building). Build it gradually to the most you can absorb, not the most an elite can (training for your own ability), because the main risk is injury from doing too much too soon. A small amount of harder work adds the finishing stimulus.
- Sleep. The highest-leverage recovery tool there is, and the cheapest. Adaptation is consolidated during rest, and short sleep is associated with higher injury risk (sleep; supercompensation and adaptation).
- A balanced diet, fuelled to the work. Enough carbohydrate to train and race, enough protein across the day, enough total energy to avoid the harms of under-fuelling, and iron corrected only if a blood test shows a deficiency. A varied diet does most of what the supplement shelf is sold to do (protein, supplements and recovery nutrition).
- Consistency over time. None of the above works as a single big effort. Fitness is lost faster than it is gained (detraining), so the runner who trains steadily for years beats the one who trains heroically for six weeks and breaks.
Everything else is real but secondary. Super-shoes give a genuine few per cent for those who can afford them. Caffeine, nitrate and, for the right events, bicarbonate are worth knowing about. Strength training helps. A good taper is worth more than most products. But these are the last few per cent, and they only matter once the basics are in place. Many runners invert this, optimising the 1% from a watch metric or a supplement while neglecting the volume and sleep that would actually move them.
The order of returns
If you are deciding where to spend effort, spend it from the top of this list down. Each tier matters far more than the one below it:
- Consistency. Training week after week, year after year, without the long breaks that injury or burnout force. Nothing else compounds without it, and fitness is lost faster than it is gained.
- Volume, mostly easy. The single training variable most tied to performance, built gradually so the body adapts rather than breaks (volume versus intensity).
- Sleep and recovery. Where training is converted into fitness (sleep; supercompensation).
- Adequate fuelling. Enough total energy, carbohydrate and protein to support the training and avoid the harms of under-fuelling.
- A little hard training. Threshold and intervals add the top-end stimulus, but only on a base of the four tiers above.
- The last few per cent. Super-shoes, caffeine, nitrate, bicarbonate, strength work, a sharp taper, and the recovery gadgets. Real, but worth chasing only once the tiers above are solid.
A useful test before adopting anything new: which tier is it in, and is every tier above it already handled? Most runners pour effort into tier 6 while leaving tiers 1 to 4 on the table.
People respond differently, so treat even the basics as a starting point to tune to yourself rather than a law (individual variation).