A
That claim is strongly opinionated and not aligned with the overall scientific evidence on running.
Mark Sisson (often associated with the “ancestral health” / Primal-style movement) is a real former elite endurance athlete, but his conclusion here goes well beyond what research supports.
What the evidence actually shows about running
Regular running is one of the most extensively studied forms of exercise in public health and sports science. Across large population studies, it is generally associated with:
Lower all-cause mortality risk
Reduced cardiovascular disease risk
Improved insulin sensitivity and metabolic health
Better mental health outcomes (on average)
Even modest amounts (e.g., slow jogging a few times per week) show benefits compared with inactivity.
Where the “too strenuous for almost everyone” idea comes from
There is a kernel of truth, but it gets overstated:
1) Injury risk is real
Running has a relatively high rate of:
overuse injuries (knees, shins, Achilles tendon)
especially when people increase volume too quickly
So it’s not “risk-free.”
2) Diminishing returns at high volumes
Very high mileage (elite marathon training levels) can show:
increased injury burden
possible cardiac remodeling in extreme endurance athletes (still debated in interpretation)
But this applies to extreme training, not recreational running.
3) Selection bias in “experts should walk it back”
This argument often:
focuses on outliers (injured runners, ultramarathon risks)
ignores population-level data showing net benefit
What mainstream exercise science actually recommends
Major health bodies (WHO, CDC, NHS) still recommend:
150–300 minutes/week of moderate activity OR
75–150 minutes/week of vigorous activity (running counts here)
And they explicitly include running as a valid way to meet those guidelines.
Walking is also strongly recommended—but not as a replacement for all vigorous activity unless necessary.
A more accurate framing
A fair, evidence-based version would be:
Running is highly beneficial for most people when done in appropriate doses, but it carries a higher injury risk than walking and should be progressed gradually.
Not:
Running is too strenuous for almost everyone.
Bottom line
Running is not inherently harmful or “too strenuous” for most people
It is dose-dependent: small-to-moderate amounts are strongly beneficial
The main limitation is how people train, not running itself
If you want, I can break down:
walking vs running vs cycling (which is “best” for longevity data)
or how to run safely with minimal injury risk (which is where most problems actually come from)
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