Counting back
| Goal | From a regular running base | Building the base too |
|---|---|---|
| 10 km | 8 to 12 weeks | Add 6 to 8 weeks |
| Half marathon | 10 to 16 weeks | Add 8 to 10 weeks |
| Marathon | 12 to 20 weeks | Add 10 to 12 weeks |
| Trail, 20 to 55 km | 12 to 18 weeks | Add 8 to 12 weeks |
| Trail, 70 km and up | 16 to 24 weeks | Add 12 weeks or more |
These are conventions, and we label them as such. No study has compared plan lengths against each other.
What the evidence does support: the last stretch should be a taper 1, and how fast you add volume is where the risk sits 23.
What to do before the block starts
The weeks before a plan are the cheapest place to buy yourself a better block.
- Get regular before you get serious. Three to five easy runs a week for a month beats a heroic first week of the plan.
- Fix the niggle. Something you have been ignoring will not survive twelve weeks of building.
- Find your real paces. Not the ones you would like. A plan written on wishful numbers falls apart in week four.
- Enter the race. An ambition that is not on a calendar quietly becomes next year.
Fitting it round a life you already have
The plan you finish beats the plan that was optimal.
Decide before the block how many days a week you can genuinely run. Build the plan on that number, not the one you wish you had.
Four running days with two real sessions, done for sixteen weeks, takes almost any runner further than six days attempted for five weeks and abandoned.
The same goes for disruption. Travel, a bad cold, a rough month at work — these are normal. A block that cannot absorb them was badly built. And you lose fitness far slower than you fear: a missed week is not a lost block 4.
How we handle this
Every plan starts from your race date and works backwards.
The number of training days comes from you, not from a template. Where the evidence is thin — plan length, long-run distance, how fast to build — we use conventions and say so, rather than passing a convention off as a finding.
Every race page on this site shows the date and counts back to the week a block would need to begin.
Questions people actually ask
I have eight weeks until my marathon. What now?
Can I shorten the taper to fit more training in?
What if I miss two weeks in the middle?
How many days a week do I need to run?
References
Every figure above rests on one of these studies. Author and year are enough to find the paper.
- Bosquet (2007)
- Nielsen RØ (2014)
- Buist (2008)
- Mujika (2000)