End-of-Season Data Review: How to Evaluate Progress Using a Full Year of Training Data

Introduction

After the Taipei Marathon every December, many runners enter a “down period” and resume training a few weeks later. But during this transition, one thing with more strategic value than rest is often skipped: an annual training data review. This isn’t about nostalgia—it’s about using the data accumulated over the entire year to identify what truly drove your progress (or plateau), so next year’s training plan is built on facts rather than intuition.

Why Is an Annual Review Important?

Individual training sessions carry a lot of noise, influenced by sleep, weather, and mood, making it hard to draw reliable conclusions. But a dataset spanning 52 weeks can reveal statistically significant patterns: which months produced the best training results? Which workout types work best for you? Under what circumstances do injuries occur? Only an annual perspective can answer these questions.

Step 1: Quantify the Full Year of Training

Pull the following baseline data from your Garmin Connect or Strava annual statistics page:

Fill in this table and you’ll have the most basic full-year overview. All subsequent analysis builds on this foundation.

Step 2: Progress Indicator Analysis

VO₂max trend: On the “Health” page in Garmin Connect, VO₂max has a historical trend chart. Compare the values from the start and end of the year. If you logged more than 40 effective training weeks and VO₂max didn’t rise (or even dropped), it signals a fundamental issue with your training approach or recovery management that needs to be addressed.

Personal record (PR) improvement across distances:

• Compare your best times for 1K, 5K, 10K, half marathon, and full marathon
• Calculate the percentage improvement compared to the same period last year
• Note: race results are affected by conditions, so try to compare performances under similar circumstances

Heart rate efficiency improvement: Pick a fixed route you ran 3 or more times during the year (such as a specific riverside section), and compare your average heart rate at the same pace between the start and end of the year. If your heart rate dropped by 5–10 bpm, that’s concrete evidence of significantly improved aerobic efficiency.

Step 3: Identify Injury Patterns

This is one of the most valuable parts of the annual review. Look back at the timing of injuries or discomfort and analyze them using the following question framework:

• Was weekly mileage abnormally high before the injury? (More than 30% above the 4-week average?)
• Were there consecutive high-intensity sessions without recovery days before the injury?
• Did the injury occur in a specific season? (Taiwanese runners often get injured in October–November when training volume spikes sharply while preparing for the year-end marathon)
• Did the same area get injured repeatedly? (If so, it means an underlying strength or biomechanical issue remains unresolved)

Step 4: Training Intensity Structure Assessment

Strava’s annual heart rate zone time distribution, or Training Peaks’ annual training load report, can reveal whether your year-round intensity structure was sound.

Ideal annual intensity distribution for endurance runners (based on the 80/20 principle):

• Zone 1–2 (easy aerobic): 70–80% of training time
• Zone 3 (marathon pace): 10–15%
• Zone 4–5 (threshold and above): 10–15%

If your Zone 3 share exceeds 30%, that’s the classic “moderate-intensity trap”—not easy enough to effectively build the aerobic base, yet not hard enough to effectively stimulate the lactate threshold. Next year’s reform direction is “make the easy easier, and make the hard harder.”

Step 5: Key Inputs for Designing Next Year’s Plan

The ultimate purpose of the annual review is to provide a factual foundation for next year’s plan:

Practical Tips

• Spend 2–3 hours in late December on the annual review: Organize the numbers into a personal “annual report”—no specific format needed, just honesty
• Compare with the same period last year, not with others: Running progress is personal; the only meaningful comparison is with your past self
• Record “the most effective workouts”: What types of 3–5 sessions gave you the greatest sense of improvement this year? Prioritize keeping these next year
• Export the annual summary using Garmin Connect’s “My Statistics”: Taiwanese users can view complete annual data in the app, or export a CSV from the website for deeper custom analysis

Conclusion

An annual data review isn’t a privilege reserved for elite runners—it’s a habit anyone serious about training should adopt. Numbers don’t lie—they tell you your true training load, your true progress trajectory, and your true injury risk factors. Take the time to read these numbers, and next year’s training plan will no longer be guesswork but an evidence-based strategy. Let the data be your best coach.

Related Reading

• Road Running Season Review: Examining the Annual Training Cycle
• Road Running Long-Term Training Trends: Seasonal Pattern Analysis of One Year of Training Data
• Road Running Training Log: How to Analyze Weekly Reports to Find Training Blind Spots
• How to Keep a Running Log: Using Data Analysis to Improve Training Efficiency