The Japanese Walking method

What Japanese Walking is

Japanese Walking is interval walking training: you alternate three minutes of fast walking with three minutes of slow walking, repeat that pair five times or more, and do it on four or more days a week. One session takes about thirty minutes. There is no equipment, no gym and no particular route — the entire method is a change of pace.

The name says where it was developed, not that it is a traditional practice. The protocol comes from researchers at Shinshu University in Matsumoto, Japan, who published the first controlled trial of it in 2007. In the research literature it is always called interval walking training, or IWT; "Japanese Walking" is what it came to be called elsewhere.

The 3×3 pattern, in practice

The fast three minutes are the part that does the work. In the original trial participants were asked to walk above 70% of their peak aerobic capacity — hard enough that holding a conversation gets awkward. The slow three minutes are set at around 40%: not a stop, but easy enough to recover and go again.

Five rounds of the pair is thirty minutes, and four days a week was the prescription. Both halves of that matter. The intervals are what make the session count; the four days are what make it training rather than an occasion.

Where the method comes from

Between May and October 2004, Nemoto and colleagues at Shinshu University ran 246 middle-aged and older adults — mean age 63 — through a five-month randomised trial. One group did no walking training. One walked continuously at moderate intensity, aiming for 8,000 steps or more on four or more days a week. The third did the interval protocol described above.

The design is what makes the result interesting: the continuous walkers were not idle. They walked a great deal. The difference between the two training groups was how hard, not how much.

What the trial found

After five months, the interval group improved isometric knee extension strength by 13% and knee flexion by 17%, and peak aerobic capacity by 8% measured on a cycle and 9% measured walking. Every one of those gains was significantly larger than in the continuous-walking group. Resting systolic blood pressure also fell further in the interval group.

The authors' conclusion was carefully worded, and worth repeating in their terms: high-intensity interval walking may protect against age-associated increases in blood pressure and decreases in thigh muscle strength and aerobic capacity. That is a statement about age-related decline, not a promise about any disease.

How much brisk walking is enough?

A larger follow-up published in 2019 looked at 679 people, mean age 65, who completed five months of IWT. On average their estimated peak aerobic capacity rose 14% and their lifestyle-related disease score fell 17%.

The useful part is what predicted those gains. Improvement tracked fast walking minutes per week, rising steadily up to about 50 minutes a week and then levelling off. Slow walking time did not predict improvement. Neither did total walking time.

Read practically: roughly 50 minutes of brisk walking a week — three or four sessions of the 3×3 pattern — is where the curve flattens in that data. More is not harmful, but the returns stop growing at anything like the same rate. This was an analysis within a training cohort rather than a trial that randomly assigned different doses, so treat it as a strong hint about where the effort pays, not as a prescription.

Interval walking and blood sugar

A separate randomised trial in Copenhagen, published in Diabetes Care in 2013, tested the method in 32 adults with type 2 diabetes over four months. Interval walkers and continuous walkers were matched for energy expenditure, so again the variable was intensity rather than volume.

The interval group improved peak oxygen uptake by 16% and lost body mass, fat mass and visceral fat; continuous walking produced none of those changes. Glucose control measured by continuous monitoring improved in the interval group and deteriorated in the untrained control group.

This was a small trial in a specific population, and it is not a reason to change how you manage a diagnosed condition. If you have type 2 diabetes, it is a conversation to have with your own doctor.

What the research does not say

A 2024 review written jointly by the Copenhagen and Shinshu groups is the fairest summary available. It concludes that IWT is effective at improving physical fitness and muscle strength and at reducing factors associated with lifestyle-related disease, and that in type 2 diabetes it improves glycaemic control.

The same review is blunt about the limits. Adherence in short-term studies is high, but keeping people walking over the long term remains a challenge — particularly for those with chronic conditions or obesity. And long-term studies in real-world settings, the kind that could show an effect on hard health outcomes, have not been done.

So the honest position is this: over a few months, in controlled trials, interval walking beats steady walking on fitness, leg strength and blood pressure. What it does over a decade, nobody has yet shown.

Why not just count steps?

Step counts measure quantity. Thirty easy minutes and thirty interval minutes can produce nearly the same step count with very different training effects, and the 2019 analysis puts a number on that: it was fast walking time that predicted improvement, while total walking time did not.

That is the whole argument for the 3×3 pattern. It guarantees you spend real time at an intensity that changes your fitness, instead of hoping a daily total will get you there.

Starting this week

• Pick four days. Four is the number the studies used, and it is easier to protect than a daily promise.
• Do fewer rounds before you do easier ones. Three solid rounds beat five half-hearted ones — brisk minutes are what count.
• Use the talk test rather than a heart-rate target. It travels better between people and needs no equipment.
• Let something else keep time. Watching a clock changes how you walk; a cue at each switch lets you leave the phone in your pocket.
• Give it eight weeks before you judge it. The trials measured at four and five months.

How the app fits in

IWT — Japanese Walking times the intervals, cues every switch on your phone and your watch, tracks completed sessions and your weekly streak, and through challenges lets you do it alongside other people. The metrics a challenge can count — walks, distance, fast intervals, active days, streak weeks, elevation — are all built on completed interval sessions, so a challenge is never just a step contest.