Is running a more efficient way to travel than walking?

Methodology and 7‑minute‑mile claim

• Many doubt that 7:00 min/mile (4:20 min/km) is the “most efficient” human running speed in any general sense.
• Objections: most adults cannot run that pace at all or only briefly; it corresponds to strong club‑level performance (near ~3:00 marathon).
• Several note likely sampling bias: data probably dominated by relatively light, trained runners, not the general population.
• Commenters say walking has a clear U‑shaped efficiency curve, but human running cost vs speed is relatively flat; “one optimal pace” may be overstated.

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Running vs walking efficiency

• Distinction emphasized between:
  • Energy per distance (kcal/km) vs
  • Energy per time (kcal/hour, METs).
• Some personal analyses: calories ≈ proportional to distance × body weight; walking may use ~80% of the calories per distance compared to running.
• Faster speeds raise power output; many people hit cardiovascular limits long before any theoretical efficiency optimum.
• Efficiency is multidimensional: fatigue, joints, mental load, time in sun/cold, and time on feet all matter. For long days, a light run/jog can feel less tiring than long slow walking because you finish sooner.

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Human endurance and persistence hunting

• Multiple references to research on human evolution: humans have unusually flat running‑efficiency curves, good cooling (sweat glands, “nakedness”), and excel at endurance over many speeds.
• Discussion of persistence hunting: humans jogging animals into heat exhaustion; contrasted with quadrupeds whose optimal gaits have narrower speed ranges.
• Anecdotes and analogies extend this to human‑vs‑human “endurance advantage,” but others point out tactical and technological factors make this unrealistic in modern conflict.

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Training, fitness, and heart‑rate zones

• Many anecdotes: people who can walk 20–40 km but are destroyed by a short run; others who can run long at modest pace but can’t approach 7‑min miles.
• Age, body mass, and prior activity strongly affect feasible pace; some older runners doing high mileage still cannot hit 7‑min miles.
• Zone‑2 / MAF (low‑intensity, fat‑dominant) training is repeatedly mentioned as key to building distance capacity, even if it feels “too slow” and often includes walking at first.

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Injury risk and biomechanics

• One side claims repetitive impact from running wears out knees (cartilage, meniscus) and should count as a deferred “efficiency cost.”
• Others cite a study (linked) finding no clear association between years of running, pace, or marathon counts and arthritis.
• Technique is highlighted: forefoot or mid‑foot strike, “natural running,” and stronger legs (e.g., squats) are said to reduce knee pain; downhill running is widely reported as hard on joints.

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Weight loss, practicality, and psychology

• Multiple stories of substantial weight loss from long daily walks; walking is easy to sustain, integrate into commuting/errands, and doesn’t spike appetite as much as hard runs.
• Cycling is seen as mechanically efficient but less helpful for bone density and (for some) weight control vs walking.
• Rucking (walking with a heavy backpack) is noted as dramatically raising calorie burn.
• Several emphasize the mental benefits of running (focus, mood) even if it’s not calorically “better” than walking.

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Units, metrics, and technical nitpicks

• Complaints about imperial units for speed and kcal instead of joules; some convert METs to W/kg and note 1 MET ≈ 1.16 W/kg.
• Clarifications about “calorie” vs “kilocalorie” and about correct dimensional notation (kcal/kg/h vs kcal/(kg·h)).
• Some argue the headline violates Betteridge’s law; others note the article conflates “energy per time” with “energy per distance,” confusing the central question.