All these many studies about 1 minute exercise don’t seem to take into account how long that fitness will last, and how likely you are to get injured.

I started running about a year ago and the first thing you have to learn is there’s a bunch of body systems you need to improve - heart, ability to use oxygen, removal of lactic acid, strengthening your body so you don’t get injured and can therefore train continuously. Probably others.

And they all are best adapted by training at different speeds and intensities. So you do some fast stuff and some _really_ slow stuff and some in the middle stuff.

High intensity is definitely great exercise. It definitely does something that slow stuff doesn’t. But it doesn’t mean you should _only_ do high intensity.