A good marathon plan is not magic. It moves through four phases: base, development, sharpening and taper. Here is how to build one around your life.
By Alex · 7 min read
For my first two years of running, I had no training plan. I just ran as much as felt right. In practice, that meant switching between "not enough" and "too much, and then injured."
When I finally followed a proper plan for the half marathon, I took 20 minutes off my time in a single training block. That did not happen because I ran more. I had been running more for years. It happened because I ran the right sessions, in the right order, at the right time.
Here is what I learned about building a plan that actually works.
Almost every serious training plan follows the same four phases, whatever the race distance:
This phase builds your aerobic base — your body's ability to use oxygen over a long time. It is nearly all easy running, plus perhaps one faster tempo run each week. The goal is not to get fast yet. The goal is to prepare your body so that it can get fast later: more small blood vessels in your muscles, more energy factories inside your muscle cells, and stronger tendons and ligaments.
Base miles are boring. Run them anyway.
Now you start to add structure: moderate tempo runs, long runs with some marathon-pace running, and progression runs that get faster near the end. You are teaching your body to deal with lactate (a by-product of hard effort) at higher speeds.
This is where most amateur runners start. That is why most amateur runners stop improving.
Now the hard work begins: VO2max intervals (short, fast repeats), race-pace runs, and tune-up races. Your aerobic base lets you absorb these hard sessions without breaking down — because you built it first.
Without the base phase, this is where runners get injured. With it, this is where runners get fast.
Your weekly distance drops by 30-50%. The intensity stays. Your body finally takes in all the training from the previous 10-16 weeks, and you arrive at the start line fresh.
The taper is not a rest period. It is a precise, planned phase.
That depends on your goal race and your current fitness:
If your goal race is 8 weeks away and you have not started training, you are not too late. You simply have a shorter block. Adjust your expectations, and still follow the same phase structure inside the time you have.
This is where most self-coached runners go wrong. They have no clear easy days and hard days. Every run is a medium effort, and a medium effort gives medium results.
The research is clear: for most recreational runners, 80% of your weekly distance should be easy. Truly easy. Easy enough to hold a conversation, feel slightly bored, and wonder whether you are working hard enough.
You are. The benefits of easy running build up slowly. They keep building while you sleep and while you sit at your desk, for about 48 hours after the run. All that easy running is quietly upgrading your engine.
The other 20% is where you earn race fitness: tempo runs, intervals, and long runs with some race-pace work.
This is where VDOT helps. VDOT is a single number that describes your current running fitness. Enter a recent race result into the VDOT Calculator and you get exact paces for each training zone:
These are not rough suggestions. They come directly from your current fitness. Running faster than your easy pace on easy days does not make you fitter. It only makes you more tired.
The best training plan is the one you will actually follow. Before you build the weeks, answer these questions:
Which days can you run reliably? Most plans assume 4-5 days per week. If you can only manage 4, that is fine. Drop the recovery run, and keep the long run and the two quality sessions.
How much time do you have on the weekend? The long run is the most important session in every plan. Protect Saturday or Sunday, and treat the other day as secondary.
When is your main race? Count backwards from race day and build your phases from there. Race day is week N. The taper starts at N-2 (for a 5K or 10K) or N-3 (for a half or full marathon). Sharpening fills the weeks before that.
I built TrainPace's Training Plan Generator to do exactly this work for you. You tell it:
It then creates a complete plan with all four phases — week by week, workout by workout — with paces based on Jack Daniels' VDOT method. If you have already worked out your VDOT on the VDOT Calculator, your training paces carry over automatically.
You can also export the full plan to your calendar as an .ics file, which imports straight into Google Calendar or Apple Calendar. Every workout lands on the right date, with the duration, the description and the pace zone included.
Consistency beats everything else.
A 14-week plan where you complete 85% of the workouts will beat a 20-week plan where you complete 60%. Regular easy mileage, repeated week after week, is what drives improvement — not the occasional heroic long run.
Do not skip the easy days because they feel too easy. Do not skip the hard days because they sound frightening. Turn up, do the session in front of you, and trust the process.
The plan works if you do the plan.
Build your training plan now →
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