Flattening and Double Periodization: How Many Peaks a Year, and How to Choose the Model

The Question Periodization Answers

The essence of periodization is: how to arrange training volume, intensity, and specificity across a year so you peak at the exact time you want, while managing fatigue and avoiding overtraining. Different models suit different season structures (one big annual goal vs. multiple scattered goals vs. competing all season). Choosing the wrong model often leads to “training a lot but not peaking on race day.”

Comparison of Major Models

How to Choose: Work Backward from Season Goals

• One big annual goal: Traditional/block single-periodization—align the peak precisely to that race, with a taper beforehand (see the taper article).
• Two main annual goals (spring + fall): Double periodization—accept that each peak has a shorter preparation phase and may be slightly lower than a single-periodization all-in approach, in exchange for two competitive windows. The key is scheduling recovery and a re-building mini-cycle between peaks to avoid accumulated fatigue by the second peak.
• Frequent racing all season (e.g., road season, criterium season): Flat/maintenance model—don’t chase a single extreme peak; instead maintain multiple abilities at a high level year-round, using small fluctuations and between-race recovery management so every race is “good enough.” The focus is on load management and avoiding mid-season overtraining (see overtraining and ACWR articles).
• Advanced and needing multiple peaks: Block periodization—use concentrated stimulus plus supercompensation in rotation to create multiple sub-peaks at key points in the season.

Universal Principles (Apply to Any Model)

• Progressive overload + regular unloading: Any model requires progressive load increases and periodic unloading to let adaptations emerge (see the unloading week article); the difference is only in how they are arranged and focused.
• Maintenance doses to preserve multiple abilities: The risk of single-periodization is losing prior high-intensity adaptations during the base phase and losing base fitness during the season; use “small maintenance doses of intensity/base” to stop the bleeding (same source as the detraining article).
• Flat ≠ no periodization: It still has micro-fluctuations and between-race adjustments; it’s just that the macro amplitude is small. Misreading it as “the same thing all year” leads to excessive monotony and stagnation (see the sRPE article).
• Individualization and monitoring: Models are frameworks; actual practice relies on continuous fine-tuning via HRV/sRPE/performance/subjective feedback (see HRV and PMC articles), not blindly copying a template to the end.

Common Mistakes

• Having multiple season goals but using single-periodization → only one race peaks; form varies wildly for the rest.
• Competing all season but stubbornly sticking to linear periodization → mid-season fatigue accumulates or base fitness erodes, then a late-season collapse.
• Believing in some “best model”—there is no best, only the model that “best matches your season structure and recovery capacity.”

Periodization is not a battle of philosophical schools; it answers a practical question: on which specific days this year do you want to be at your best? One big goal means single-periodization all-in; two goals means accepting a double-periodization where each peak gives a little ground; competing all season means using a flat model to hold multiple abilities—look at your race calendar first, then choose the model, not the other way around.

Related Reading

• Periodized Training: Comparing the Pros and Cons of Linear, Alternating, and Block Approaches
• Periodization Models Compared: Linear, Block, and Polarized Training
• Volume Periodization: Stacking Base, Build, Peak, and Recovery Phases
• Periodization for Sprinters: Seasonal Allocation of Speed and Endurance