Should you walk or run?
Walking is the most accessible exercise there is. That is not a consolation prize, it is the reason to start there.
Walking is the king, and that is not a consolation prize
Fifteen cohorts. 47,471 adults. 3,013 deaths over follow-up. As daily steps went up, mortality risk went down, and then it flattened out: at around 6,000 to 8,000 steps a day for adults aged 60 and over, and around 8,000 to 10,000 for adults under 60. [1]
Past those points, more steps were not associated with further reductions in this data. Which means the target is reachable. It is not an athlete's number and it does not need a gym.
Nothing else is that accessible. Walking needs no equipment, no skill, no technique coaching, no recovery day, and no permission. You can start tonight, from your own front door, in whatever is already on your feet.
What running adds on top
Three specific things, and they are worth naming precisely rather than vaguely. Bone loading at roughly twice the peak force. A faster route to a higher aerobic ceiling. And the same energy cost in about half the time.
None of those makes walking a warm-up act. They are the reasons running is worth arriving at, not reasons to skip the walking.
You do not have to choose, and you should not start by choosing
The framing of the question is the problem. Walking and running are not two teams. They are two intensities of the same movement, and the useful question is not which one, it is when.
Week one of First Gear is three twenty-minute walks. That is the whole week. The first one could be tonight.
Running enters when your heart rate says your aerobic system is ready for it, not when a calendar says it is week four. Most people run a mile in about six weeks. Some take longer, and the plan does not mind.
If you are over 40
You are in the window where the numbers start moving. VO2 max declines in everybody, but in masters athletes the rate tracked training volume closely enough that changes in volume explained 54 percent of the variance in men. [2] Skeletal muscle falls 3 to 8 percent per decade after about age 30. [3]
None of that is an emergency and none of it is beyond reach on the timescale you care about. It is a reason to start from a walk rather than from a stopwatch, because the thing most likely to stop you is an injury in the first six weeks, and injuries in the first six weeks come from going too hard too soon.
If you are postpartum
Start with walking, and treat the return to impact as its own decision on its own timeline.
The 2019 guidelines for returning to running after birth put the earliest reasonable return to impact at around 12 weeks postpartum, and later after a cesarean. They also recommend assessment by a pelvic health physical therapist before returning to running or any high-impact sport, regardless of how you delivered. [4]
The calendar is the floor, not the test. The readiness screen those guidelines describe is a set of things your body should be able to do first, all of them without symptoms:
- Walk 30 minutes with no pain, leaking, heaviness or dragging
- Balance on one leg for 10 seconds, each side
- 10 single-leg squats per side, with control
- 10 forward bounds with a controlled landing
- One minute of jogging in place, with none of the above symptoms
Common questions
Should I walk or run to get fit?
Walk first. Matched for energy expended, walking and running produce similar reductions in risk of high blood pressure, high cholesterol and diabetes, and most of the longevity return in step-count research arrives by 6,000 to 8,000 steps a day.
How many steps a day do I actually need?
In a meta-analysis of 15 cohorts covering 47,471 adults, mortality risk leveled off at around 6,000 to 8,000 steps a day for adults 60 and over, and around 8,000 to 10,000 for adults under 60. More than that was not associated with further benefit.
When can I start running after having a baby?
The 2019 postnatal return-to-running guidelines put the earliest reasonable return to impact at around 12 weeks, later after a cesarean, and recommend assessment by a pelvic health physical therapist first. The date is a floor, not a test. Readiness is judged on symptom-free strength and impact screening.
Is walking enough exercise after 40?
For most disease-risk outcomes, walking at sufficient volume does most of the work. Running adds bone loading and raises aerobic capacity faster, both of which matter more with age. Starting with walking and adding running later gets you both.
References
- Paluch AE, Bajpai S, Bassett DR, et al.. Daily steps and all-cause mortality: a meta-analysis of 15 international cohorts. The Lancet Public Health 7(3):e219-e228, 2022.
- Burtscher J, Strasser B, Burtscher M, Millet GP. The Impact of Training on the Loss of Cardiorespiratory Fitness in Aging Masters Endurance Athletes. International Journal of Environmental Research and Public Health 19(17):11050, 2022.
- Volpi E, Nazemi R, Fujita S. Muscle tissue changes with aging. Current Opinion in Clinical Nutrition and Metabolic Care 7(4):405-410, 2004.
- Goom T, Donnelly G, Brockwell E. Returning to running postnatal: guidelines for medical, health and fitness professionals managing this population. Clinical guidance document, 2019.
- Moore IS, James ML, Brockwell E, Perkins J, Jones AL, Donnelly GM. Multidisciplinary, biopsychosocial factors contributing to return to running and running related stress urinary incontinence in postpartum women. British Journal of Sports Medicine 55(22):1286-1292, 2021.