Training · Limited evidence
How Much to Increase Running Mileage
The 10% weekly rule did not hold up; volume-related injury risk rose in runners who increased weekly distance by more than 30%.
Prospective cohort · 1 source · 2 min
What the studies show
- Overall injury risk was similar between runners who increased weekly distance by less than 10% and those who increased it by up to 30%.
- Above 30%, volume-related injuries (shin, knee, tendon) became more frequent.
How Letz applies it
A stage only progresses once the previous one has been completed without feeling difficult—never simply by the calendar—and cardio blocks increase by just a few minutes at a time.
Who it applies to
Novice runners using a GPS watch.
Limits
Observational; few injuries per subgroup and a clear difference seen only in overuse injuries.
Sources
- Nielsen et al., Journal of Orthopaedic & Sports Physical Therapy, 2014 DOI 10.2519/jospt.2014.5164
More in Training
- Resistance Training, Strength, and HypertrophyVarious training prescriptions improve strength and hypertrophy; heavier loads favor strength, and multiple sets favor hypertrophy.
- Weekly Volume: Sets per Muscle GroupMore weekly sets per muscle produce greater hypertrophy, with diminishing returns; for strength, moderate volumes already capture most of the gains.
- Frequency: training each muscle at least twice per weekTraining a muscle group twice a week is superior to once for hypertrophy; for strength, higher frequency helps primarily because it distributes volume more effectively.
- Load and rep rangeLight and heavy loads produce similar hypertrophy when sets are taken close to failure; heavy loads are superior for maximizing strength gains.