Increasing Mileage

Here are the top 5 considerations when increasing running mileage as you begin marathon build-up, focusing on consistency, performance, and injury prevention:

1. Progression Rate (Don’t Rush the Volume)

• Follow a gradual increase, commonly ~10% per week in total mileage but this varies depending on current mileage and experience. 

• Include cutback weeks every 3–4 weeks (reduce volume ~25%) to allow adaptation.

• Remember: connective tissues (tendon, fascia) adapt slower than cardiovascular fitness—this is often where overuse injuries begin.

2. Long Run Development

• Increase long run distance more slowly than weekly mileage.

• Focus on time on feet, not pace, especially at the start.

3. Intensity Balance

• As mileage increases, intensity should stay mostly easy.

• Aim for ~80% of running at easy/conversational effort.

• Avoid stacking hard days (e.g., intervals, hills, tempos on consecutive days or too close together in the week).

4. Recovery & Load Monitoring

Watch for early red flags:

• Persistent soreness (>48–72 hrs)

• Declining performance at easy paces

• Changes in sleep, mood, or motivation

• Prioritize sleep, fueling (especially carbs), and hydration

• Strength training (2x/week) improves tissue capacity and resilience.

• Remember: Adaptation happens during recovery, not during the run.

5. Individual Context (History & Lifestyle Matter)

• Previous injuries, current training age, body size, stress, and work schedule all influence safe mileage increases.

• Cross-training can help add aerobic load with less impact.

• Shoes matter—avoid making big mileage jumps in new or minimalist footwear.

Key: The “right” mileage increase is the one you can absorb.