Everything works. HIT works. Riding your bike once a week works. Walking every day works. Taking up tennis, or soccer, or frisbee works. The point is, short-dur

Everything works. HIT works. Riding your bike once a week works. Walking every day works. Taking up tennis, or soccer, or frisbee works. The point is, short-duration studies on the untrained provide little to no information. It would have been much more interesting to test and compare 3-5 different exercise modalities.