1min high-intensity exercise 3x a week improves fitness as much as 3x aerobics (2016)
It's 8 minutes, not one minuteThe people in the study were out of shape to start withThe improved measures were insulin sensitivity index, peak oxygen uptake, and "skeletal muscle mitochondrial content"No change in body massIn conclusion, if you're out of shape, you can improve a limited number of fitness measures just as much doing 3x8 minutes of higher intensity exercise as much 3×45m less intense exercise over 12 weeks