Our verdict: Japanese interval walking is one of the better-tested walking routines there is. In trials lasting a few months, adults in their 60s who alternated 3 minutes of brisk walking with 3 minutes of easy walking improved their walking fitness, thigh strength and blood pressure more than people who walked at a steady moderate pace [1]. It is free, needs no equipment and is gentle on the joints.
It isn't magic. Most of the evidence comes from one research group, the studies lasted months rather than years, and many viral claims about it go further than the research does. This review covers what holds up and what doesn't. We make a Japanese walking app, so we have an interest; we've tried to stick to what the papers say.
The short version
| Our take | |
|---|---|
| Does it improve fitness? | Yes, in the trials: more than steady walking over 5 months |
| Strength of evidence | Good for a walking method: several trials with hundreds of people, mostly from one group in Japan |
| Who was studied | Mainly middle-aged and older adults; one small trial in people with type 2 diabetes |
| Time needed | 30 minutes, about 4 days a week in the studies |
| Cost | Free. A timer helps |
| Weight loss | Small changes in some studies; not designed or tested as a weight-loss plan |
| Biggest drawback | Keeping time at every switch, and sticking with it for months |
What Japanese walking is
Japanese interval walking, also known as interval walking training (IWT), is a walking method that alternates three minutes of brisk walking with three minutes of slower walking. A typical session repeats this cycle five times, for 30 minutes. “Fast” means brisk for you, so talking takes effort; “easy” means a relaxed stroll. It was developed by Hiroshi Nose's group at Shinshu University in Japan. The complete guide covers the method step by step.
What the studies found
- Better than steady walking for fitness (2007). In a 5-month randomised trial of 246 adults with a mean age of 63, the interval group's thigh strength rose 13–17% and their peak aerobic capacity for walking rose 9%, significantly more than in the steady-walking group. Their resting systolic blood pressure also fell more [1].
- Gains across fitness levels (2011). Among 666 adults around 65 who completed 4 months of training, fitness and thigh strength rose and blood pressure, blood glucose and body fat fell. The least fit gained the most [2].
- The fast minutes do the work (2019). In 679 adults, improvements tracked the minutes spent walking fast each week, up to about 50 minutes, then levelled off. Slow or total walking time didn't predict the gains [4].
- Outside Japan (2013). A small Danish trial of 32 people with type 2 diabetes found that interval walking improved fitness and glucose control while energy-matched steady walking did not [3].
What the studies didn't show
- Independent replication is thin. Most participants were from the Matsumoto area, in studies run by the group that developed the method.
- Months, not years. The trials measured fitness and risk markers over 4–5 months, not long-term outcomes such as heart attacks or lifespan.
- Mostly older adults. Results in younger or already-fit people may differ.
- Sticking with it is hard. A 2024 review by researchers from both groups calls long-term adherence a challenge that still needs work [5].
- Lab-set intensity. In the trials, “fast” was set from each person's measured capacity. Walking by feel is a practical approximation.
Viral claims, checked
“Japanese walking melts belly fat.”
Not supported. Some studies measured small drops in body weight and body fat, but the method wasn't designed or tested as a weight-loss program [2].
“It's better than 10,000 steps.”
They were never compared head to head. The interval studies compared it with steady walking, not with a step target. See Japanese walking vs 10,000 steps.
“30 minutes is all you need.”
The studies asked for 30 minutes on at least 4 days a week, for months. One session a week isn't what was tested.
“It's an ancient Japanese practice.”
No. It was developed by university researchers in the early 2000s. “Japanese walking” is a nickname the method picked up online.
Pros and cons
Pros
- Backed by randomised trials, which is rare for a walking routine.
- Free, with no equipment, gym or membership.
- Low-impact: it is walking, never running.
- Fits in 30 minutes and works outdoors, indoors or on a treadmill.
- “Fast” is relative to you, so it scales from beginners to fit walkers.
Cons
- Keeping time is fiddly: ten switches in 30 minutes means checking a clock or using a timer.
- The fast minutes should feel like real effort, which some people find uncomfortable at first.
- Most evidence comes from one group and one age range.
- It takes regular practice over months; the benefits in the studies came from consistency.
Who it suits, and who it doesn't
A good fit if you: already walk and want more from the same time; prefer low-impact exercise to running; are older, returning to exercise, or find gyms intimidating; like a simple routine with a clear structure.
Maybe not if you: want to train for a race; need a supervised rehabilitation program; or have a condition where brisk effort isn't advised. Talk to your doctor before starting if you have heart disease, high blood pressure, diabetes, or joint or balance problems.
How to try it for two weeks
- Pick 4 days a week and a 30-minute slot.
- Walk easy for a few minutes to warm up.
- Do 3 minutes fast, 3 minutes easy, 5 times. Start with 2 or 3 rounds if 5 is too many.
- Use a timer so you aren't watching the clock: our free web timer, or the free NipponWalk app.
- After two weeks, ask yourself: can I keep this up? That matters more than any single session.
Frequently asked questions
Is Japanese walking legit?
Yes. It comes from published randomised trials at Shinshu University, and the core finding (interval walking improved fitness more than steady walking) has been repeated in several studies. It isn't a miracle method, and most evidence is from one research group.
How long does it take to see results?
The studies measured changes after 4 to 5 months of walking at least 4 days a week. Many people find it feels easier within a few weeks, but that is not what the studies measured.
Is it safe?
For most people it is walking with some brisk minutes, so it is low-risk. Check with your doctor first if you have a heart condition, high blood pressure, diabetes, or joint or balance problems, and stop if you feel chest pain or dizziness.
What do people find hardest?
Keeping time without staring at a watch, and keeping going for months. A timer with spoken cues solves the first; a weekly goal you can actually keep helps with the second.
References
- Nemoto K, Gen-no H, Masuki S, Okazaki K, Nose H. Effects of high-intensity interval walking training on physical fitness and blood pressure in middle-aged and older people. Mayo Clinic Proceedings. 2007;82(7):803–811. doi:10.4065/82.7.803 · PubMed 17605959
- Morikawa M, Okazaki K, Masuki S, Kamijo Y, Yamazaki T, Gen-no H, Nose H. Physical fitness and indices of lifestyle-related diseases before and after interval walking training in middle-aged and older males and females. British Journal of Sports Medicine. 2011;45(3):216–224. doi:10.1136/bjsm.2009.064816 · PubMed 19846423
- Karstoft K, Winding K, Knudsen SH, Nielsen JS, Thomsen C, Pedersen BK, Solomon TP. The effects of free-living interval-walking training on glycemic control, body composition, and physical fitness in type 2 diabetic patients: a randomized, controlled trial. Diabetes Care. 2013;36(2):228–236. doi:10.2337/dc12-0658 · PubMed 23002086
- Masuki S, Morikawa M, Nose H. High-intensity walking time is a key determinant to increase physical fitness and improve health outcomes after interval walking training in middle-aged and older people. Mayo Clinic Proceedings. 2019;94(12):2415–2426. doi:10.1016/j.mayocp.2019.04.039 · PubMed 31477320
- Karstoft K, Thorsen IK, Nielsen JS, Solomon TPJ, Masuki S, Nose H, Ried-Larsen M. Health benefits of interval walking training. Applied Physiology, Nutrition, and Metabolism. 2024;49(7):1002–1007. doi:10.1139/apnm-2023-0595 · PubMed 38507778