The short answer
In small supervised trials, a few short, hard stair climbs a day raised peak fitness within six weeks in healthy, inactive young adults. A 2026 review of trials agrees on fitness, with moderate confidence. It found no clear effect on other health measures.
What did the stair climbing trials find?
Three trials tested short stair climbs spread through the day or week. All lasted six weeks, and all were supervised.
| Trial | People | What they did | What they found |
|---|---|---|---|
| Jenkins 2019 [1] | 24 healthy, inactive young adults, 12 per group, mostly women | Three climbs of about 20 seconds a day, as fast as they safely could, 3 days a week for 6 weeks | Peak fitness rose about 5% in the climbers and ended higher than in a non-exercising group, whose fitness fell slightly |
| Yin 2024 [2] | 42 healthy, inactive young adults | Three all-out climbs of 30 seconds a day, at least 1 hour apart, 3 days a week for 6 weeks | Peak fitness rose about 7%. A group doing 40 minutes of moderate cycling did not change significantly, but the trial was not designed to compare the two |
| Allison 2017 [3] | Two small groups of healthy, sedentary women (12 and 11), with no non-exercising group | Three 20-second all-out climbs, or three 60-second climbs up and down one flight, 3 days a week for 6 weeks | Peak fitness rose about 12% with the 20-second climbs and about 7% with the 60-second climbs |
Fitness here means peak oxygen uptake (VO2peak), a standard lab measure. The Allison studies had no non-exercising comparison group, so their gains could partly reflect other things, such as getting used to the test.
The climbs were hard. Heart rate averaged about 85% of age-predicted maximum in the first trial [1] and about 78% of maximum in the second [2]. Every climb followed a warm-up, and the second trial reported no adverse events [2].
What does the combined evidence say?
A 2026 review in the British Journal of Sports Medicine pooled 11 randomized trials of exercise snacks in inactive people. Six measured fitness, and all six used supervised stair climbing. Together they showed a clear fitness gain, with individual trials ranging from about 5% to 17%. The authors rated their confidence as low at first and moderate after removing one trial that made the results look inconsistent. They added that check after planning the review [4].
For leg strength, body composition, blood pressure and blood fats, the review found no significant effect [4]. The trials above point the same way: resting blood pressure did not change [2][3], and neither did fasting blood sugar or insulin [3].
What do these trials not show?
They tested young, healthy, inactive adults for six weeks, under supervision and with hard efforts. They do not show the same gains in older adults or people with health conditions, for climbs done without supervision, or beyond six weeks.
The studies are also related. Jenkins and Allison come from the same lab, and Jenkins and Yin share a co-author. The 2026 review was done by a different group [4].
Nor do the trials show that stair snaqs match a longer workout. The comparison with cycling in the second trial was preliminary, because the trial was not built for it [2].
Should I try stair climbing?
Stair climbing is a vigorous snaq in our library. It is optional, and gentler snaqs count too; see How hard is a snaq? for the range. Moves that look similar, such as step-ups, were not tested in these trials.
If you have a heart, blood pressure, circulation, joint or back condition, check with your doctor before trying hard bursts. Our Health & Safety page has the details.
Questions
Can 20-second stair climbs improve fitness?
In small supervised trials, yes. A few hard climbs a day, three days a week for six weeks, raised peak fitness in healthy, inactive young adults [1][2][3]. A 2026 review found moderate-certainty evidence of a fitness gain [4].
How long is each climb?
The trials used climbs of about 20 to 60 seconds [1][2][3]. Each climb in the first two trials came after a warm-up [1][2]. The research does not show an ideal length.
Does stair climbing help with blood pressure or body composition?
The research here does not show that. A 2026 review found no significant effect on blood pressure, blood fats or body composition [4].
Is a stair snaq as good as a workout?
The research does not show that a stair snaq matches a longer workout. What it does show is how little time was involved. In a small six-week trial in healthy, inactive young adults, three climbs of about 20 seconds, three days a week, raised peak fitness [1]. That is about a minute of climbing a day, or about 3 minutes a week, not counting the warm-up. The one trial with a comparison group was not designed to compare the two, and its authors call the finding preliminary [2].
What if I do not have stairs?
These trials tested stairs, so we cannot say other moves give the same result. Gentler snaqs have their own research, which we cover in other posts.
Are snaqs safe for me?
Not for everyone. If you have a heart, blood pressure, circulation, joint or back condition, have diabetes, are pregnant or recently gave birth, or have any other health concern, check with your doctor first. Stop if you feel chest pain, severe breathlessness, dizziness, faintness or unusual pain. Our Health & Safety page has the details.
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Sources
- 1 · Randomized controlled trialJenkins EM, Nairn LN, Skelly LE, Little JP, Gibala MJ. Do stair climbing exercise "snacks" improve cardiorespiratory fitness? Applied Physiology, Nutrition, and Metabolism. 2019;44(6):681-684. doi:10.1139/apnm-2018-0675
- 2 · Randomized controlled trialYin M, Deng S, Chen Z, et al. Exercise snacks are a time-efficient alternative to moderate-intensity continuous training for improving cardiorespiratory fitness but not maximal fat oxidation in inactive adults: a randomized controlled trial. Applied Physiology, Nutrition, and Metabolism. 2024;49(7):920-932. doi:10.1139/apnm-2023-0593
- 3 · Training studies, no control groupAllison MK, Baglole JH, Martin BJ, et al. Brief intense stair climbing improves cardiorespiratory fitness. Medicine & Science in Sports & Exercise. 2017;49(2):298-307. doi:10.1249/MSS.0000000000001188
- 4 · Systematic review and meta-analysisRodriguez MA, Quintana-Cepedal M, Cheval B, et al. Effect of exercise snacks on fitness and cardiometabolic health in physically inactive individuals: systematic review and meta-analysis. British Journal of Sports Medicine. 2026;60(2):133-141. doi:10.1136/bjsports-2025-110027
This post is for general information and is not medical advice. See our Health & Safety page.