Think about the average person’s eating on a busy day. Few sit down to one big meal and call it done. We eat enough so that the day is not thrown off, but small enough to keep the energy steady. Now exercise scientists are asking whether movement works in the same way.
Now there’s a word for that question. Researchers call it exercise snacking, and snack-sized workouts- bursts of movement lasting anywhere from 15 seconds to five minutes- are producing results that stack up against a full trip to the gym. This isn’t about selecting a 10-minute slot and powering through. (See our guide to 10-minute micro workouts at home.) Instead, it disperses that same effort into several small moments.
WHAT IS A SNACK-SIZED WORKOUT?
Researchers divide these into two related classes. VILPA is vigorous intermittent lifestyle physical activity (VILPA), which is spontaneous movement such as running up the stairs when you’re running late, or power walking to catch a bus. Nobody plans for it. Exercise snacking is intentional, deciding ahead of time to do fifteen squats before checking your phone, or climb two flights of stairs on purpose during a call.
The phrase itself is older than most assume. A Harvard-based cardiologist first used it in 2007, long before wrist-worn trackers made it possible to measure these tiny bursts of effort. It took nearly 20 years for science to catch up with the accelerometer data.
WHAT THE LATEST RESEARCH TELLS US
One synthesis published in the British Journal of Sports Medicine combined eleven clinical trials that included more than four hundred adults who weren’t regular exercisers. It was pioneered by a doctoral researcher at the University of Oviedo in Spain who defined an exercise snack as a burst of moderate to vigorous effort lasting five minutes or less, twice a day, several days a week, for at least a month. The team was surprised by how the results were broken down by age. The greatest increase in cardiorespiratory fitness was observed in adults younger than 65 years. Older adults increased their muscular endurance – muscles’ ability to keep working without getting tired – more than younger adults. But most striking was how well people stuck with the plan, because small, flexible bits of exercise render the usual excuses of no time and no motivation moot.
Another cohort study published in the International Journal of Behavioural Nutrition and Physical Activity followed thousands of American adults with no structured exercise through wrist-worn accelerometers. Adults who did about five short bursts of vigorous activity a day – none lasting more than a minute – had a risk of death from any cause about half that of adults who did none.
WHY SMALL DOSES MAY BEAT ONE BIG DOSE
There is a behavioural reason that snack-sized workouts may quietly succeed where longer plans fail. One decision must survive an entire day of interruptions. That decision is to do one sixty-minute session. And then a meeting runs long, or a deadline shifts, and the plan falls apart because it was planned for one good solid chunk of time. If you distribute that effort across five or six moments, then if one of those fails you’ll have less impact, as opposed to one point of failure.
There’s also a physiological side. Eating raises your blood sugar. If you do a little activity before or immediately after a meal, your muscles will pull glucose out of your blood without having to wait for insulin to do its thing. People who did short bursts of intense movement before each meal had better blood sugar control over a full day than those who did one longer session in the morning, a University of Otago study found. Cortisol has a similar rhythm, waxing and waning along a workday, and short movements at the right time can dull those rises before they escalate into the tension we describe in our piece on wellness burnout and how the body signals it early.
MAKING A WHOLE DAY SNACK MENU
Treat the day the way you would treat meals. Small servings at several points instead of one heavy sitting. This is a useful way to plan this out. Calisthenics with the running toothbrush timer, squats in between video calls, a stair climb before lunch to meet the glucose spike that comes with eating, a walk during the slump that hits mid-afternoon, push-ups while dinner cooks.
You don’t need a gym bag or a free chunk of time for any of this, just a phone reminder for a week or two, until it’s automatic. This means that being active during the day is also associated with falling asleep more easily at night, which we also cover in our guide to falling asleep naturally after 40.
WHO GAINS THE MOST
That age divide from the Oviedo research is worth considering when you’re trying to determine what your own snacks should look like. Younger adults get more benefit from cardio snacks such as stairs or brisk walks. If you are over 65 and want to stay capable and active as you age, strength-focused snacks that maintain your muscle and balance are more helpful. This could also be useful for those who are experiencing unexplained weight changes – something we delve into further in our piece on what really helps.
A FEW THINGS YOU MAY WANT TO KNOW BEFORE YOU BEGIN
A couple of honest notes before you go down this rabbit hole as a total replacement for structured exercise. Snacks are most beneficial for beginning or maintaining fitness, as the research has been predominantly on cardiorespiratory fitness and muscular endurance, not the muscle building that takes months of progressive resistance training.
Intensity, too, is more important than most believe. A minute of stairs, striding at a pace brisk enough to make talking feel truly difficult, doesn’t mean the same thing as a stroll to the printer. If you have heart disease, uncontrolled high blood pressure or other conditions where sudden vigorous activity could be dangerous, check with your doctor first.
FREQUENTLY ASKED QUESTIONS
- ARE SNACK-SIZE WORKOUTS AS GOOD AS A FULL WORKOUT?
Studies show big gains in fitness and blood sugar control for people who do no organised exercise, closing a large part of the gap, even if not quite matching the benefits of a complete programme. - HOW MANY SHOULD I DO A DAY?
Most trials were two or more sessions per day. In cohort studies, benefits increased with about four to eight short bursts a day, and plateaued. - IS WALKING FAST ENOUGH TO COUNT?
Yes, so long as it is brisk enough to get your heart rate up and make conversation a little more difficult. - CAN THIS BE DONE SAFELY BY BEGINNERS OR OLDER PEOPLE?
Yes. Evidence suggests that older adults may benefit even more from this, particularly with respect to muscular endurance. If you have a condition, consult with a doctor first. - ARE EXERCISE SNACKS THE SAME AS MICRO WORKOUTS?
No, not particularly. A micro workout is one continuous session, such as the structured 10-minute routine that’s covered separately on this site. Snacking on exercise is taking a few short bursts of exercise throughout the day.
CLOSING THOUGHTS
All the evidence continues to point in one direction. You don’t need a start time, an end time, or a gym membership for movement to count, just a desire to have it in small doses. One snack today. One more to add the
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