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Timmons' system takes so little time, yet produces measurable benefits, he believes it could have a big impact in reducing cases of diabetes - after all, even the busiest of people ought to be able to spare 10 minutes a week for exercise.

Workouts can be done on an exercise bike (as was used in the study). Or you could run upstairs or even sprint flat out on the spot. Literally anything will do as long as you push yourself to the max.

"The key," says Timmons, "is to do four 30-second sprints on an exercise bike at your maximum effort, with short rests in between bursts. The whole thing should take about four minutes. Doing this, even just twice a week, will bring clear benefits."