Running Training Periodization: A Complete Plan for the Base, Build, and Race Phases

Why do some runners train hard yet see their performance stall, or even decline? The answer often lies in the lack of “periodization” in their training plan. Periodization is one of the most central concepts in sports science — doing the right training at the right time so the body reaches peak condition on race day.

What Is Training Periodization?

Training periodization is a systematic method of dividing a full year or a training block into several phases, each with a different training focus and intensity. Its core ideas are:

1. The body cannot develop all abilities at once: aerobic endurance, speed, and lactate threshold need to be trained in focused stages
2. The principle of supercompensation: stimulus → recovery → adaptation → a higher level — this takes time
3. Peak form has a limited window: you cannot stay in top condition all year; you must plan deliberately to peak for your target race

Jack Daniels’ Four-Phase Theory

Legendary running coach Dr. Jack Daniels proposed the most widely adopted training periodization framework in his classic book Daniels’ Running Formula.

Overview of the Four Phases

Phase	Name	Typical Length	Main Training Focus	Emphasis
Phase I	Foundation	4-6 weeks	Aerobic base, strength	85%+ Easy running
Phase II	Early Quality	4-6 weeks	Repetitions, hill runs	R pace training introduced
Phase III	Transition Quality	4-6 weeks	Intervals, Tempo	I pace + T pace
Phase IV	Final Quality	4-6 weeks	Race pace, taper	Race-specific work

Jack Daniels’ Five Training Paces

Code	Name	Definition	Heart Rate Zone	Training Purpose
E	Easy	Conversational pace	Zone 1-2 (65-78% HRmax)	Aerobic base
M	Marathon	Comfortably purposeful pace	Zone 2-3 (78-84% HRmax)	Marathon-specific
T	Threshold	“Comfortably hard”	Zone 4 (84-88% HRmax)	Lactate threshold
I	Interval	Hard but controlled	Zone 5 (95-100% HRmax)	VO2max
R	Repetition	All-out sprint	N/A (speed-focused)	Running economy

Reference Pace Values

For a runner targeting a 3:45 marathon (5:20/km):

Pace Type	Pace	Heart Rate (assuming HRmax=185)
E (Easy)	6:10-6:40/km	120-145 bpm
M (Marathon)	5:18-5:22/km	145-155 bpm
T (Threshold)	4:55-5:05/km	155-163 bpm
I (Interval)	4:28-4:35/km	172-185 bpm
R (Repetition)	4:00-4:10/km	N/A

Sample 16-Week Marathon Training Plan

Below is a complete 16-week plan for a runner targeting a sub-4:00 marathon (5:41/km). It suits intermediate runners with a weekly mileage of 40-60 km, targeting races such as the Taipei Marathon (December) or the Wan Jin Shi Marathon (March).

Phase I: Foundation (Weeks 1-4)

Goal: Build an aerobic base and strengthen the running frame

Item	Content
Weekly mileage	35 → 40 → 45 → 40 km (recovery in week 4)
Running days	5-6 days/week
Long run	12 → 14 → 16 → 12 km
Intensity distribution	85% Easy running, strength training 2x/week

A typical week (Week 3):

• Monday: Rest
• Tuesday: E run 8 km @ 6:30/km
• Wednesday: E run 6 km + 6 × 100m strides
• Thursday: E run 8 km @ 6:20/km
• Friday: Rest or cross-training
• Saturday: Long run 16 km @ 6:30/km
• Sunday: E run 6 km (recovery run)

Strength training focus:

• Squats 3×12
• Lunges 3×10 per side
• Single-leg deadlifts 3×10 per side
• Plank 3×45 seconds
• Calf raises 3×15

Phase II: Early Quality (Weeks 5-8)

Goal: Introduce speed stimulus, improve running economy

Item	Content
Weekly mileage	45 → 48 → 52 → 45 km
New training	Hill repeats, short R-pace intervals
Long run	18 → 20 → 22 → 16 km
Intensity distribution	75% Easy running, 10% R pace, strength 2x/week

A typical week (Week 7):

• Monday: Rest
• Tuesday: 2km warm-up + 8 × 200m @ R pace (200m jog recovery) + 2km cool-down
• Wednesday: E run 8 km
• Thursday: Hill repeats — 8 × 150m uphill hard + jog down
• Friday: E run 6 km
• Saturday: Long run 22 km @ 6:20/km
• Sunday: E run 6 km (recovery)

Phase III: Transition Quality (Weeks 9-12)

Goal: Raise lactate threshold and VO2max — the most critical stage of training

Item	Content
Weekly mileage	50 → 55 → 58 → 48 km
Core training	Tempo runs + I-pace intervals
Long run	24 → 26 → 28 → 20 km
Intensity distribution	70% Easy running, 15% T pace, 10% I pace

A typical week (Week 11):

• Monday: Rest
• Tuesday: 2km warm-up + 5 × 1000m @ I pace 4:50/km (400m jog recovery) + 2km cool-down
• Wednesday: E run 8 km
• Thursday: 2km warm-up + 25-minute Tempo run @ 5:20/km + 2km cool-down
• Friday: E run 6 km
• Saturday: Long run 28 km (first 20km @ 6:20, last 8km @ 5:40 — simulating M pace)
• Sunday: E run 6 km (recovery)

Phase IV: Race Phase (Weeks 13-16)

Goal: Race-specific training + taper, so the body peaks on race day

Item	Content
Weekly mileage	50 → 45 → 38 → 25 km (race week)
Core training	M-pace long runs, race simulation
Long run	22 → 16 → 12 → race
Intensity distribution	65% Easy running, 20% M pace, 10% T pace

Week 13 (race-specific):

• Tuesday: 2km warm-up + 3 × 1600m @ I pace + 2km cool-down
• Thursday: 2km warm-up + 20-minute Tempo @ T pace + 2km cool-down
• Saturday: Long run 22 km (middle 14km @ M pace 5:40)

Week 14 (begin tapering):

• Mileage drops to 75% of normal
• Maintain intensity but reduce volume
• Last moderately hard Tempo run on Thursday

Week 15 (major taper):

• Mileage drops to 60% of normal
• Only a light 6 × 400m @ I pace on Tuesday
• Long run reduced to 12 km Easy

Week 16 (race week):

• Monday to Wednesday: 4-6 km Easy each day
• Thursday: 3 km Easy + 4 × 100m strides (keep legs sharp)
• Friday: Complete rest or a 2 km easy walk
• Saturday: Day before the race — 2 km Easy jog + stretching
• Sunday: Race day!

The Science of Tapering

Why Is Tapering So Important?

Tapering is the gradual reduction of training volume in the 2-3 weeks before a race, allowing the body to recover fully without losing fitness. Research shows that proper tapering can improve performance by 2-6%.

Tapering Principles

Item	Adjustment
Mileage	Reduce by 40-60%
Intensity	Keep unchanged (key!)
Frequency	Keep the same or reduce slightly (1-2 fewer sessions per week)
Duration	2-3 weeks for a marathon, 10-14 days for a half marathon

Common Tapering Mistakes

1. Tapering too much: not running at all makes you lose your running feel
2. Tapering too little: the body cannot fully recover
3. Lowering intensity: maintaining intensity is key to keeping the legs sharp
4. Panic training: feeling like you “haven’t trained enough” and adding extra sessions during the taper

Annual Training Planning

Season Planning for Taiwanese Runners

Taiwan’s road running season runs mainly from October through March of the following year. Here is a typical annual plan:

Month	Phase	Target Race (example)
April-June	Base aerobic phase	Maintain fitness, cross-training (avoiding the heat)
July-August	Heat-acclimation + base phase	Heat-adaptation training, strength training
September-October	Quality phase	Introduce speed and threshold training
November	Race-specific phase	Taroko Marathon (November)
December	Peak + race	Taipei Marathon (A-race)
January	Recovery + rebuild	Rest 2 weeks → restart the base phase
February-March	Second quality + race phase	Wan Jin Shi Marathon (B-race)

A-Races vs. B-Races

• A-race: The most important target race(s) of the year (1-2 races), around which all training is planned
• B-race: A secondary goal or “practice race,” which doesn’t need a perfect taper
• C-race: Fun runs, group runs, done mainly for enjoyment

Training Log and Adjustment

What Should You Record?

Item	Importance	Tool
Daily mileage and pace	★★★★★	Garmin/Strava
Heart rate data	★★★★	Heart rate monitor
Rate of perceived exertion (RPE)	★★★★★	Self-rated 1-10
Sleep quality	★★★★	Watch/self-rated
Morning resting heart rate	★★★	Measured upon waking daily
Body weight	★★★	Measured at a fixed time weekly
Injury log	★★★★★	Written notes

When Should You Adjust the Plan?

• Morning resting heart rate 5+ bpm above normal for 3 consecutive days: possible overtraining, cut back for a week
• Heart rate persistently elevated at the same pace: accumulated fatigue, schedule an extra rest day
• Persistent pain that isn’t normal DOMS: stop running and see a doctor — don’t push through it
• Cold or illness: symptoms above the neck can allow easy running; symptoms below the neck (chest tightness, fever) require complete rest

Conclusion

Training periodization is not an unreachable piece of sports-science jargon — at its core it simply means “training with a plan.” Choose your target race (Taipei Marathon, Wan Jin Shi, Taroko), count back 16-20 weeks from race day, and structure your training through the base phase → quality phase → race phase rhythm, and your performance will surely take a real leap forward. Remember Jack Daniels’ famous words: “Every workout should have a purpose.”

Related Reading

• Running Periodization Basics: How to Divide Time Among the Base, Build, Peak, and Recovery Phases
• Jack Daniels’ 4-Phase Plan: The Elegant Design of A-B-C-D Periodization
• Marathon Periodization Training: The Four Stages of Base, Build, Race, and Adjustment
• Mileage Periodization: Stacking the Base, Build, Peak, and Recovery Phases