[Gatsky]

I don't understand your problem with the research/article. All they are claiming is that short intense intervals produce comparable improvement in aerobic fitness and metabolic variables as longer endurance exercise, in untrained young men. This is supported by many other studies.

It doesn't try to prove that they will be equally good at running 10K, or have the same 'mental' benefits. That's a separate issue.

Think about all the people that are unable or unwilling to exercise like you do. Is it nonsense that they could significantly improve their health with short intense exercise? Who cares about fast and slow twitch fibres.