Four-minute bursts of high-intensity exercise such as running on a treadmill, three times a week are enough to increase fitness, researchers found.
[. . .]
Health guidelines generally state that we should undertake at least 150 minutes of moderate exercise or 20 minutes of vigorous exercise per week in order to stay healthy.
But the new study suggests that just 12 minutes of high-intensity exercise, spread out across three sessions, could be enough to keep us fit and healthy, researchers said.
But I suppose walking back and forth between the couch and the refrigerator doesn't count as "high-intensity exercise." Oh, well.