It's an exhausting minute, but, hey, it seems worth a try.
Is one minute the shortest possible H.I.I.T. workout or will I be writing about a 30-second workout soon?
I think one minute may be the limit. We are still looking for the exact sweet spot in terms of how little intense effort people can do and still get significant health and fitness benefits. So far, it looks as if three repetitions of 20-second intervals is the lowest effective load. But we are still experimenting. Stay tuned.