ABSTRACT We define exercise snacks as isolated ≤1-minute bouts of vigorous exercise performed periodically throughout the day. We hypothesize that exercise snacks are a feasible, well-tolerated and time-efficient approach to improve cardiorespiratory fitness and reduce the negative impact of sedentary behaviour on cardiometabolic health. Efficacy has been demonstrated in small proof-of-concept studies. Additional research should investigate this novel physical activity strategy.