Is 16 Minutes of Training a Week Enough? What a New Study Found
Quick answer: A randomised trial by Aube, Mendolia and colleagues, published 17 June 2026 in the Journal of Functional Morphology and Kinesiology, put 58 adults on 16, 27 or 90 minutes a week of bodyweight training for six weeks. All three groups improved their fitness by the same amount. Strength and endurance gains leaned slightly toward the longest protocol.
Sixteen minutes a week is four sessions of four minutes. It is less time than most people spend deciding what to watch.
That number sounds like a scam. It is also what one group in this trial actually did, four days a week, in a room with no equipment, and their cardio fitness improved as much as the group training nearly six times longer.
What the researchers actually did
Fifty-eight untrained but healthy adults were randomly assigned to one of three published bodyweight programmes, all stripped down so they could be done indoors with no equipment.
TAB (16 minutes a week). Four days a week, one Tabata block per day: eight rounds of 20 seconds all-out and 10 seconds rest, using burpees, mountain climbers, jumping jacks, or a squat thrust to shoulder press. Four minutes of work per session.
5BX (27 minutes a week). Three days a week. Five one-minute intervals at maximum effort, separated by a minute of rest: burpees, high knees, split squat jumps, mountain climbers, squat jumps.
AMRAP (90 minutes a week). Three days a week, 30 minutes each. As many rounds of a fixed circuit as possible, resting only when needed.
Before and after, everyone did a cycle test to volitional fatigue, a grip test, and max-rep tests on dumbbell row, chest press, shoulder press, Romanian deadlift, goblet squat, and a hollow hold. Every session was supervised.
The trial was pre-registered as a non-inferiority test, which matters. The researchers committed in advance to a threshold: if the short protocols came within 2.6 mL/kg/min of the long one on estimated peak oxygen uptake, they would count as not worse.
What they found
The fitness result came out flat. Everyone improved, and the confidence intervals for the difference between the short protocols and the long one sat comfortably inside the non-inferiority threshold the team had set in advance. The formal comparison for a group difference came back at p = 0.31, which means the study could not tell the three protocols apart on cardio fitness.
The muscular endurance tests are where it gets more interesting.
Extra reps gained after 6 weeks, by weekly training time
- 16 min/week
- 27 min/week
- 90 min/week
View the data
| Group | Goblet squat | Romanian deadlift | Shoulder press | Chest press |
|---|---|---|---|---|
| 16 min/week | 11.9 reps | 7.5 reps | 8.9 reps | 5.5 reps |
| 27 min/week | 9.3 reps | 5.6 reps | 5.5 reps | 8.9 reps |
| 90 min/week | 18.5 reps | 14.5 reps | 8.4 reps | 8.6 reps |
Look at the lower body. The 90-minute group added 18.5 goblet squat reps and 14.5 Romanian deadlift reps, roughly half again as many as the 16-minute group. The formal statistics could not call that a real difference at this sample size, but the pattern is consistent enough that the authors flagged it.
The cycle test told a similar story.
Extra seconds before fatigue on the cycle test
View the data
| Group | 16 min/week | 27 min/week | 90 min/week |
|---|---|---|---|
| Change after 6 weeks | 16 sec | 36 sec | 32 sec |
The team then ran a Bayesian model that pooled all the muscular endurance outcomes together. That model estimated the 90-minute group gained about 3.7 more reps on average than the 16-minute group, with a credible interval that stayed above zero. The 27-minute group sat in between and could not be separated from the shortest one.
So: identical on cardio fitness, probably a small edge to more volume on muscular endurance.
Why did the shortest protocol keep up?
Cardiorespiratory fitness responds mostly to how hard you push, not how long you push for.
Think of it as a ceiling test. Your peak oxygen uptake is the top of a range, and the way to raise a ceiling is to keep bumping into it. A 20-second burpee interval at genuine maximum effort bumps into it. Twenty-nine more minutes of moderate circuit work, with rest breaks whenever you need them, mostly happens below it.
That is the researchers' proposed explanation rather than something this trial measured directly, and it is worth saying plainly. What they did measure was cardiovascular load, and the 90-minute group's was far higher. It bought them nothing extra on the fitness test.
Muscular endurance behaves differently. Reps are cumulative in a way that a ceiling is not, so the group doing three times the work getting more of them is exactly what you would expect. The surprise is not that AMRAP won on reps, it is how small the margin was.
What this study doesn't prove
These were untrained people. Nobody had been in a structured programme for six months. Untrained bodies improve on almost anything, which compresses the gap between a good protocol and a great one. If you already lift four days a week, none of these numbers are yours.
Nothing here measured muscle growth. There was no DXA scan, no ultrasound, no biopsy. Max reps on a goblet squat is muscular endurance, not hypertrophy. A programme that raises your rep count is not automatically a programme that builds muscle.
Six weeks is short. The authors say so themselves. Differences between protocols often need longer to appear, and every comparable trial they cite ran four to six weeks too.
The protocols differed in more than time. They varied in exercise selection, interval length, work-to-rest ratio, and intensity. So this is a comparison of three named programmes, not a clean test of volume, and the authors flag it as a major limitation.
The non-inferiority threshold was generous. It was set at 2.6 mL/kg/min because that was the smallest gap detectable with a sample they could afford. Real differences smaller than that could exist and this trial would have missed them.
Fitness was estimated, not measured. Peak oxygen uptake was predicted from cycle power using a regression equation built on a separate group of 26 people. That is a reasonable proxy, not a gas-analyser reading.
The study was funded by Canada's Natural Sciences and Engineering Research Council. The authors declare no conflicts of interest.
How to test this in your own training
The trial reports a group average. You are one person, and the individual response analysis in this paper found the range of outcomes was wide even inside a single group. So run it yourself.
- Pick your floor, not your ideal. Decide the smallest amount of training you would actually do in a bad week. Four four-minute sessions is a real answer. So is two 20-minute ones.
- Log the sessions you complete, not the ones you planned. The whole point of a minimum dose is adherence, and adherence is only visible in hindsight. Write down what happened.
- Pick two numbers to watch. One strength or rep number (max push-ups, goblet squat reps at a fixed weight) and one work capacity number (how long a circuit takes). Test both before you start.
- Give it eight weeks, not six. Long enough for the trend to separate from a bad night's sleep.
- Retest under identical conditions. Same time of day, same weight, same rest. Then compare the two dates in your log rather than trusting your memory of how it felt.
If you are running this alongside a barbell programme, the same logic applies to your lifting volume. Our guide to how many sets per week to build muscle covers where the returns start flattening there, and junk volume covers what happens past that point.
The three protocols side by side
| Protocol | Weekly time | Sessions | Structure |
|---|---|---|---|
| TAB | 16 minutes | 4 per week | 8 x 20 sec all-out, 10 sec rest |
| 5BX | 27 minutes | 3 per week | 5 x 60 sec all-out, 60 sec rest |
| AMRAP | 90 minutes | 3 per week | 30 min, as many circuit rounds as possible |
The middle column is the one worth staring at. AMRAP asked for five and a half times the weekly minutes of TAB, and both left the six weeks with the same estimated fitness.
Logging a minimum dose without it becoming a chore
Bodyweight work is annoying to log in a normal gym app. There is no weight to enter, the sets are timed rather than counted, and half the exercises are not in the exercise picker. So most people stop logging, and then have no idea six weeks later whether anything changed.
Gym Note Plus is built for the other approach: type the session as a plain line of text, the way you would in your notes app.
- Write
burpees 20s x8orgoblet squat 20kg x24and it becomes structured data - Per-exercise history, so your rep counts from week one sit next to week eight
- Handles timed work, AMRAP blocks and supersets without a special mode
- Works offline, which matters when you are training in a spare room
If you want to see what that looks like before installing anything, paste your last session into the free notes to workout translator and watch it come back structured.
The cheapest training programme is the one you still run in week eight. This study suggests the floor is lower than most people think.
Frequently Asked Questions
What did the 2026 bodyweight training study find about minimum effective dose?
The trial by Aube and colleagues, published 17 June 2026, compared 16, 27 and 90 minutes a week of bodyweight training over six weeks in 58 adults. All three produced equivalent cardiorespiratory fitness gains. The 90-minute protocol showed a small, statistically uncertain advantage on muscular endurance tests.
Is 16 minutes of exercise a week actually enough?
For improving cardiorespiratory fitness in a previously untrained adult, this six-week trial says yes, provided those 16 minutes are genuinely all-out interval work. It says nothing about building muscle, and the participants had not trained in six months, so a trained lifter should not expect the same.
Does more training volume build more muscle?
This study did not measure muscle size, so it cannot answer that. Separate research consistently shows hypertrophy scales with weekly hard sets up to a point. The finding here is narrower: cardiorespiratory fitness stopped responding to extra volume well before muscular endurance did.
What is a Tabata protocol?
A Tabata protocol is eight rounds of 20 seconds of maximum-effort work separated by 10 seconds of rest, totalling four minutes. In this trial the TAB group performed one Tabata block four days a week using burpees, mountain climbers, jumping jacks, or a squat thrust to shoulder press.
Can bodyweight training replace lifting weights?
Not for maximal strength, since you cannot load a push-up the way you load a bench press. This trial improved muscular endurance and fitness in untrained adults with no equipment. For a lifter, minimalist bodyweight work is better framed as a floor for bad weeks than as a replacement.
How long should I test a new training routine before judging it?
Give it at least eight weeks and compare logged numbers rather than how you feel. This trial ran six weeks and its authors noted that differences between protocols may need longer to appear. Fix your test conditions, weight, rest and time of day, so the comparison is honest.
Final Takeaways
- The floor is lower than you think. Sixteen minutes a week of all-out bodyweight intervals matched 90 minutes for fitness in untrained adults over six weeks.
- Fitness and endurance responded differently. Cardio gains flattened with extra volume. Rep counts kept climbing, though not by enough to reach significance.
- Intensity is doing the work. The short protocols were short because they were hard, not because they were easy.
- This is a six-week trial in untrained people. Treat it as evidence that a minimum dose exists, not as a prescription for a trained lifter.
- Your own log is the only version that applies to you. Pick two numbers, hold the conditions steady, and retest in eight weeks.
Josh Ibbotson
Josh is the creator of Gym Note Plus, building tools that make workout tracking as simple as taking notes.
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