The other way of doing it then is high intensity interval training, right? And again, there's a bit of misnomer around this. So if you think about your heart rate profile, if you're going to do a CrossFit class or an F 45 or something like that, and you look at your heart rate, it is high throughout the class. Like you get a little dip when you recover in between the sets, but you're high all the way through. There's four blocks of four minutes that's 16 minutes with either three or six minutes recovering. It's going to take you about half an hour.

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