Recreational marathon pace sits below threshold

High confidence

Everyday marathoners race at roughly 79 to 93 percent of their critical speed, about 85 percent on average, so race pace sits well under the upper threshold. A 2:30 marathoner runs at about 93 percent of it, a 6-hour marathoner at about 79 percent. The slower your goal time, the bigger that gap.

Why it works

Your threshold pace depends on fitness and roughly tracks your race ability. Faster runners hold a quicker pace at threshold. As goal times get slower, marathon pace drops progressively further below that threshold.

What it means in practice

For most recreational marathoners, marathon pace sits well under threshold pace, so a marathon-pace run and a threshold run are different kinds of training. No study shows one beats the other for recreational runners, so either is reasonable. Describe race-pace running as pacing rehearsal, not as threshold work.

The evidence

Jones, A.M., Kirby, B.S., Clark, I.E. et al. (2021). Physiological demands of running at 2-hour marathon race pace. Journal of Applied Physiology.

In 16 world-class male distance runners, VO2peak was 71.0 ± 5.7 mL/kg/min, lactate threshold sat at 18.9 ± 0.4 km/h (83% VO2peak) and the lactate turnpoint at 20.2 ± 0.6 km/h (92% VO2peak). Two-hour marathon pace (21.1 km/h) is above the turnpoint, so for these athletes marathon pace is not sub-threshold. In the 7 athletes who reached a steady state at 21.1 km/h, it cost 191 ± 19 mL/kg/km, about 4.0 L/min or 94% of VO2peak. The sample is small (n=16) and elite-only, which bounds how far these numbers generalize.

n=16
Smyth, B., Maunder, E., Meyler, S. et al. (2022). Decoupling of Internal and External Workload During a Marathon: An Analysis of Durability in 82,303 Recreational Runners. Sports Medicine.

Recreational runners raced the marathon below their estimated critical speed: about 88% of CS in the low-decoupling third, 86% in the moderate third and 82% in the high-decoupling third. Average decoupling was 1.16 and was first detected about 25 km into the race. The low-decoupling group finished faster (217 vs 239 minutes for the high-decoupling group) and decoupled later (33 vs 19 km). Adding decoupling to a model based on critical speed and the curvature constant cut marathon-time prediction error from 6.45% to 5.16%.

n=82303
Smyth, B., Muniz-Pumares, D. (2020). Calculation of Critical Speed from Raw Training Data in Recreational Marathon Runners. Medicine & Science in Sports & Exercise.

Using raw training and race data from more than 25,000 recreational marathon runners, the authors showed that critical speed (the fastest pace a runner can hold in a physiological steady state) can be estimated straight from everyday GPS data. The best model, built from 400 m, 800 m, and 5,000 m efforts, predicted marathon finish time with about 7.67% error. Runners raced the marathon at roughly 84.8% of critical speed on average, with faster runners holding about 93% and slower runners about 78.9%. Runners averaged about 87.6% of critical speed early in the race, and those who ran the first half above about 94% of critical speed (particularly faster than it) were more likely to slow by more than 25% in the second half.

Why we call confidence high

Two large cohorts of recreational marathoners measured this directly from training and race data. Smyth and Muniz-Pumares (2020, more than 25,000 runners) found runners raced at 84.8% of critical speed on average, from 93% for 2:30 finishers to 78.9% for 6-hour finishers. Smyth (2022, 82,303 runners) found race speeds of 82-88% of critical speed across groups, with faster finishers closer to it. Jones 2021 found the hypothetical 2-hour marathon pace (21.1 km/h) sits above the lactate turnpoint (20.2 km/h) of world-class men.

Where it applies

Recreational marathoners (roughly 2:30 to 6:00 finishers in the cohorts). It also extends to sub-marathon-pace events for similar runners. Critical speed here was estimated from training data, not lab tests.

Does not apply to: world-class marathoners, whose race pace sits close to or above the lactate turnpoint; the first (lower) lactate threshold: recreational marathon pace is likely above LT1, so this claim refers only to the upper threshold.

Plans that respect this

Plans that scored well on the rubric measures informed by this claim.

Last reviewed Oct 14, 2026. See how we score.