Periodized Training: Comparing the Pros and Cons of Linear, Undulating, and Block Periodization, with Recommendations for Selection

What Is Periodized Training

Periodization is the strategic adjustment of training volume, intensity, and content across different phases to avoid the stagnation caused by “training at the same intensity all year.” Since Tudor Bompa proposed the theory in 1965, it has become a cornerstone of modern sports science.

But “periodization” is not a single model—there are at least three major approaches: linear periodization, undulating periodization, and block periodization.

Linear Periodization

Model

• Progresses from base phase → build phase → peak phase → race phase
• Training volume gradually decreases
• Training intensity gradually increases
• Each phase lasts 4–8 weeks

Example (16-Week Marathon Preparation)

• W1–W6: Base phase (high volume, low intensity, 60K weekly mileage)
• W7–W10: Build phase (volume and intensity balanced, 70K weekly mileage + threshold runs)
• W11–W14: Peak phase (volume slightly reduced, intensity increased, VO2max intervals added)
• W15–W16: Taper phase (volume significantly reduced, race-pace runs)

Advantages

• Simple to understand and execute
• Suitable for beginners
• Most effective when there is a clear race goal

Disadvantages

• Each energy system is trained only once per year
• Not suitable for multi-season athletes (multiple races per year)
• High-intensity training is concentrated in the later phase, leading to fatigue accumulation

Suitable For

• Beginner to intermediate endurance athletes
• 1–2 major races per year
• Amateur cyclists and runners

Undulating Periodization

Model

• Rotates different intensities and training types within the same week
• Alternates high-intensity and low-intensity sessions
• Weekly focus varies slightly

Example (One-Week Training Schedule)

• Monday: Rest
• Tuesday: VO2max intervals (5×3 minutes @ Z5)
• Wednesday: Recovery run (Z1, 8K)
• Thursday: Threshold run (30 minutes Z4)
• Friday: Rest
• Saturday: LSD (22K Z2)
• Sunday: Tempo run (10K Z3)

Advantages

• High training variety, avoids monotony
• Stimulates multiple energy systems simultaneously
• Suitable for long-term training (no obvious plateau)
• Lower psychological fatigue

Disadvantages

• Requires experience to design
• “Peak timing” before races is harder to control
• Requires detailed logging and review

Suitable For

• Advanced endurance athletes
• Multiple races per year (1 per month or per quarter)
• Those with 2–3 years of training experience

Block Periodization

Model

• Focuses on a single energy system every 2–4 weeks
• Moves to the next block only after one block is completed
• Each block is followed by 1 week of tapering

Example (12-Week Preparation)

• W1–W3: Strength block (weight training + hill sprints)
• W4: Taper
• W5–W7: VO2max block (high-intensity intervals)
• W8: Taper
• W9–W11: Threshold and race-pace block
• W12: Pre-race taper

Advantages

• Deeper adaptation than undulating periodization
• Progress is easy to quantify (test once per block)
• Suitable for elite athletes pursuing peak performance

Disadvantages

• High training monotony, mentally demanding
• Untrained systems decline during short periods
• Not suitable for multi-season athletes

Suitable For

• Elite athletes
• A clear single race goal (e.g., the biggest event of the year)
• Those with 4–5 years of training experience

Comparison Table of the Three Models

Model	Training Variation	Adaptation Depth	Psychological Difficulty	Best Suited For
Linear	Low	Medium	Low	Beginners
Undulating	High	Medium	Medium	Intermediate to advanced
Block	Medium	High	High	Elite

Selection Recommendations

One Major Race per Year (e.g., Full Marathon, Wuling)

• Recommended: Linear periodization
• Count back 16–20 weeks from the target date

Multiple Races per Year (e.g., Monthly 5K/10K)

• Recommended: Undulating periodization
• Maintains multi-system capacity, ready to race at any time

Pursuing a Personal Best (PB)

• Recommended: Block periodization
• Combine with a coach, physiological monitoring, and pre-race testing

Hybrid Application Strategy

In fact, elite athletes often combine all three:

• Use linear periodization at the start of the season to build a base
• Use undulating periodization during the season to maintain form
• Use block periodization before key races to break through

Amateurs can also follow this logic: use linear periodization for the first major race of the year, then switch to undulating periodization to maintain fitness.

Monitoring Metrics

Regardless of which model you choose, you should monitor:

• Weekly training load (TSS, distance, time)
• HRV (heart rate variability)
• Rating of perceived exertion (RPE)
• Sleep quality
• Monthly testing (FTP, 5K time, threshold run pace)

Conclusion

Periodization is not about “using one training plan for a whole year”—it is about “making deliberate adjustments.” Understanding the differences between linear, undulating, and block periodization, and choosing based on your race goals, age, and years of training, is what makes every week of training meaningful. The core of periodization is making “progress” planable and predictable.

Related Reading

• Periodization Training Models Compared: Linear, Block, and Polarized Training
• The Science of Periodization in Cycling Training: Linear, Undulating, and Block Periods Compared
• The Modern Evolution of Periodized Training: How Do Traditional, Block, and Reverse Periodization Differ?
• The Complete Guide to Periodized Training: How to Scientifically Plan Your Annual Training Program