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It must be one set of 5 reps per hour, not one sprint every 12 minutes.

That's how exercise usually works, and the study is concerned with the "least amount of exercise that can acutely improve fat metabolism and other aspects of health". Activity spaced out every 12 minutes would be disruptive and defeat that purpose.

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Article states 4s activity followed by 45s seated rest, repeated 5 times. So you're actually occupied with the workout task for 4m+05s every hour, even though only 20s of that is sprinting.

And it's not an activity you'll do at or near your desk, so you're going to have to travel somewhere to do it.

It depends on your desk.

True. And the location of said desk.

Thank you, so that explains the 45-s rest mentioned.

I assume then each 4-s workout is followed by a 45-s rest. So 49-s * 5 = 245-s (4 min) spend each hour on the excercises.

you have an off by one fencepost error ;)

You only need to rest four times!

Fencepost error– great visual, thanks

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