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QN: HIIT: Is there a shortcut to exercise?

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We all know that exercise is good for us, but often struggle to do the 150 minutes of moderate level activity a week that's recommended. So what's the alternative, asks Michael Mosley.
A few years ago, while making a Horizon documentary called The Truth about Exercise I was introduced to something which changed my life - HIIT or High Intensity Interval Training. Typically you do a few very short bursts of intense cycling on an exercise bike, with brief recovery periods.
The promise of HIIT is that you will get maximum benefit in minimum time - and that is certainly what I have found. But how well does it compare to other forms of exercise? With the help of researchers from Nottingham University we decided to find out.
We started by recruiting a group of 24 volunteers, aged between 40 and 60, who all have jobs and lifestyles that are best described as "pretty sedentary". We then divided them into four groups.


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