Exercise Snacks: Can just four minutes of exercise a day improve blood sugar?

About this episode

Could four one-minute bursts of exercise really improve blood sugar? We try “exercise snacks” ourselves before taking a close look at the clinical trial that inspired headlines. We explain why the study’s main result wasn’t statistically significant, how 34 secondary outcomes complicated the story, and what pre-registration can reveal about a study after it’s published. Along the way, we compare notes on our own exercise-snacking adventures, debate continuous glucose monitors, and ask how much evidence a single study should generate before it becomes health news. Statistical topics • Crossover design • Multiple testing • Pre-registration • Primary vs secondary outcomes • Randomized controlled trial • Research transparency Methodologic Morals • “It's good relationship advice to be transparent. It's also good research advice.” • “If the primary outcome is not significant, say it up top.” References • Babir FJ, Marcotte-Chénard A, Sandilands RE, et al. Exercise snacks performed in real-world settings reduce postprandial hyperglycaemia and glycaemic variability in individuals living with type 2 diabetes: a randomised crossover study. Diabetologia. 2026;69(8):2200-2211. doi:10.10