Training Monotony Calculator

Frequently Asked Questions

• What is training monotony?

  Training monotony = weekly mean daily load ÷ standard deviation of daily loads. Developed by Foster (1998), it measures how much daily training varies. High monotony means training is the same intensity every day.

• Why is high training monotony bad?

  High monotony (>2.0) means little variation in daily training. The body adapts better with alternating hard and easy days. Constant same-intensity training leads to accumulated fatigue and higher illness/injury risk.

• What is a good monotony score?

  Monotony < 1.5 is generally safe. Values 1.5–2.0 indicate moderate concern. Values > 2.0 are high and associated with increased injury and illness risk according to Foster's research.

• How do I reduce training monotony?

  Vary daily session intensity and duration. Alternate hard and easy days. Include full rest days (0 AU). Plan weeks with clear easy, moderate, hard, and rest days.

• What is the relationship between monotony and illness?

  Foster (1998) found athletes with high monotony and strain had significantly more illness and injury. The body needs variable stimulus for adaptation — constant same-stress impairs recovery.

• How is standard deviation calculated for monotony?

  Calculate each day's session load (RPE × duration). Find the mean of all 7 days (including rest days as 0). Calculate standard deviation of all 7 values. Divide mean by SD.

• Should rest days count as 0 in monotony?

  Yes. Rest days = 0 AU. Including them reduces monotony because 0 increases daily variation. A training week with 4 sessions and 3 rest days typically has lower monotony than 7 sessions.

• What is the difference between monotony and strain?

  Monotony measures daily variation. Strain = weekly load × monotony. Both are useful metrics. High strain is especially dangerous when both weekly load and monotony are elevated simultaneously.

• Can monotony be too low?

  Very low monotony (< 0.5) means extreme variation — very hard days followed by near-zero days. This can be problematic for endurance development. Moderate variation around 1.0–1.5 is ideal.

• How often should I calculate monotony?

  Calculate weekly, every Monday for the previous week. Track trends over 4–8 weeks. A single high-monotony week is less concerning than consistently high values.

• Is training monotony used in professional sports?

  Yes. It's used in AFL, rugby, soccer, and endurance sports for athlete monitoring. Part of the Foster training load monitoring system alongside weekly load and strain.

• What other metrics complement monotony?

  Use monotony alongside weekly training load, training strain, ACWR, wellness questionnaires, and HRV. No single metric tells the whole story.