How strong is the evidence for Exercise Snacks?

'Exercise snacks' are very brief, often under a minute, vigorous bouts of activity woven into daily life, such as a fast flight of stairs or a brisk uphill walk, made measurable by wrist-worn accelerometers that can detect movement patterns self-report cannot capture. That evidence is currently rated moderate (67/100), built on 9 published studies, including 3 randomized controlled trials and 2 meta-analyses -- a reasonable base, but not yet enough for full certainty.