How to Build a Training Plan for Your Goal Race (Without Guessing)
A periodized marathon training plan isn't magic — it's a structured progression through base building, development, sharpening, and taper. Here's exactly how to build one around your life.
By Alex · 7 min read
For the first two years I ran, I didn't have a training plan. I just ran however much felt right, which usually meant alternating between "not enough" and "too much and then injured."
When I finally committed to a structured plan for the half marathon, I dropped 20 minutes in a single training block. The improvement wasn't from running more — I'd been running more for years. It was from running the right things, in the right order, at the right time.
Here's what I learned about building a plan that actually works.
The Four-Phase Model
Every serious training plan — regardless of the race distance — follows a variation of the same four-phase structure:
1. Base Building (40% of your training)
This is aerobic foundation work. Almost entirely easy running, with maybe one tempo effort per week. The goal isn't to get fast. The goal is to build the physiological infrastructure that lets you get fast later: capillary density, mitochondrial development, connective tissue resilience.
Base miles are boring. Run them anyway.
2. Development (30% of your training)
You start adding structure here — moderate tempo runs, steady long runs with some marathon-pace effort, progressive runs. You're teaching your body to clear lactate at higher speeds.
This is where most amateur runners start. Which is why most amateur runners plateau.
3. Sharpening (25% of your training)
Now the hard work begins: VO2max intervals, race-pace efforts, tune-up races. Your aerobic base absorbs these high-intensity sessions without breaking down — because you built it first.
Without the base phase, this is where runners get hurt. With it, this is where runners get fast.
4. Taper (5-10% of your training)
Volume drops 30-50%. Intensity stays. Your body consolidates the adaptations from the previous 10-16 weeks. You show up to the start line fresh.
The taper is not a rest period. It's a precision phase.
How Long Should Your Plan Be?
This depends on your goal race and current fitness:
If you're 8 weeks from your goal race and haven't started training, you're not late — you're just training for a shorter block. Adjust your expectations accordingly, and still follow the phase structure within the time you have.
The Biggest Mistake: Running All Runs at the Same Pace
This is where most self-coached runners fail. They don't have distinct easy days and hard days — they have a continuous medium effort that produces continuous medium results.
The research is clear: for most recreational runners, 80% of weekly mileage should be easy. Truly easy. The kind of pace where you can hold a conversation, feel slightly bored, and question whether you're working hard enough.
You are. The aerobic adaptations from easy running are cumulative. They accumulate while you're sleeping, while you're sitting at your desk, for 48 hours after the run. All that easy running is silently upgrading your engine.
The other 20% is where you earn race fitness: tempo runs, intervals, long runs with race-pace efforts.
What Paces Should You Train At?
This is where VDOT comes in. Enter a recent race result into the VDOT Calculator and you'll get exact paces for each training zone:
- Easy pace: conversations happen
- Marathon pace: controlled hard
- Threshold pace: comfortably uncomfortable
- Interval pace: hard but not sprint
- Repetition pace: fast
These aren't suggestions. They're scientifically derived from your current fitness. Running faster than your easy pace on easy days doesn't make you fitter — it makes you more tired.
Building Around Your Life
The best training plan is one you'll actually follow. Before you build the weeks, answer these questions:
Which days can you reliably run? Most plans assume 4-5 days per week. If you can only do 4, that's fine — cut the recovery run, keep the long run and two quality sessions.
What time do you have on the weekend? The long run is the cornerstone of every plan. Protect Saturday or Sunday. Make the other day secondary.
When is your "A" race? Count back from race day. Build your phases from there. Race day is week N. Taper starts N-2 (for 5K/10K) or N-3 (for half/full). Sharpening fills the weeks before that.
The Free Training Plan Generator
I built TrainPace's Training Plan Generator to automate exactly this process. You tell it:
- Your goal race (5K, 10K, Half, Marathon)
- Your race date
- Your available training days
- Your current fitness level
- Your goal time (optional)
It generates a complete periodized plan — week by week, workout by workout — with paces derived from Jack Daniels' VDOT methodology. If you've already calculated 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 directly into Google Calendar or Apple Calendar. Each workout lands on the correct date with the duration, description, and pace zone included.
The Most Important Principle
Consistency beats everything.
A 14-week plan where you hit 85% of the workouts will outperform a 20-week plan where you hit 60%. The compounding effect of consistent easy mileage is what drives improvement — not the occasional heroic long run.
Don't skip the easy days because they feel too easy. Don't skip the hard days because they sound intimidating. Show up, execute the session in front of you, and trust the process.
The plan works if you do the plan.
Build your training plan now →