- Aug 15, 2018
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"Exercise snacks" is the term researchers use for very short bouts of activity — a minute or two of vigorous movement, or a brief set of something — scattered through the day between your actual training sessions. It sounds like a consolation prize for people who can't train properly, but the studies behind it are more interesting than the name suggests.
The glucose data came first. Work by Francois, Dempsey, and others on "activity snacks" showed that brief walking or simple resistance bouts every 30 minutes blunted post-meal glucose and insulin spikes in adults with insulin resistance better than a single continuous 30-minute walk in some comparisons — spreading the stimulus across the day did something one bout didn't. Then the McMaster group (Islam, Gibala, and colleagues) tested vigorous snacks: three daily bouts of stair climbing, about 60 steps taken hard, three days a week for six weeks, improved cardiorespiratory fitness by roughly 5 % in sedentary young adults in a 2019 Applied Physiology, Nutrition, and Metabolism trial — a small but real gain from about a minute of hard effort a day.
More recent work has pushed into muscle and function. Studies of pre-meal "snack" protocols using bodyweight exercises, and trials in older adults doing brief sit-to-stand or squat bouts through the day, suggest frequent muscle contractions help offset the metabolic drag of long uninterrupted sitting — which matters even for people who train, because an hour in the gym doesn't fully erase ten hours in a chair in the metabolic data.
To be clear about what snacks are not: they are not a hypertrophy program, and nobody sensible is replacing progressive training with them. Think of them as the floor under a training life — glucose control, blood flow, joint lubrication, breaking up sitting — plus a practical tool on days when a full session isn't happening, where a few hard minutes beats the all-or-nothing of skipping entirely.
Do you build any movement into the gaps of your day — stairs, walks between tasks, a few sets of something at home — or is it all concentrated in your sessions? Desk workers especially, do you notice a difference on days you break up the sitting?
The glucose data came first. Work by Francois, Dempsey, and others on "activity snacks" showed that brief walking or simple resistance bouts every 30 minutes blunted post-meal glucose and insulin spikes in adults with insulin resistance better than a single continuous 30-minute walk in some comparisons — spreading the stimulus across the day did something one bout didn't. Then the McMaster group (Islam, Gibala, and colleagues) tested vigorous snacks: three daily bouts of stair climbing, about 60 steps taken hard, three days a week for six weeks, improved cardiorespiratory fitness by roughly 5 % in sedentary young adults in a 2019 Applied Physiology, Nutrition, and Metabolism trial — a small but real gain from about a minute of hard effort a day.
More recent work has pushed into muscle and function. Studies of pre-meal "snack" protocols using bodyweight exercises, and trials in older adults doing brief sit-to-stand or squat bouts through the day, suggest frequent muscle contractions help offset the metabolic drag of long uninterrupted sitting — which matters even for people who train, because an hour in the gym doesn't fully erase ten hours in a chair in the metabolic data.
To be clear about what snacks are not: they are not a hypertrophy program, and nobody sensible is replacing progressive training with them. Think of them as the floor under a training life — glucose control, blood flow, joint lubrication, breaking up sitting — plus a practical tool on days when a full session isn't happening, where a few hard minutes beats the all-or-nothing of skipping entirely.
Do you build any movement into the gaps of your day — stairs, walks between tasks, a few sets of something at home — or is it all concentrated in your sessions? Desk workers especially, do you notice a difference on days you break up the sitting?