> We need to figure out what form of excercise gives the most benefit for unit of time spent. Retrospective observational studies like the one in the original

> We need to figure out what form of excercise gives the most benefit for unit of time spent. Retrospective observational studies like the one in the original post aren't going to to that though. Although I agree with you in principle, the differences between types of exercise are likely to be small compared to the benefit of doing anything at all. Most of the population aren't that concerned with what type of exercise gives the biggest delta in VO2 max.