In the BBC, and I believe I saw this on Art's private blog.
Rather than slaving away for hours in the gym, people should focus their attention on quick "sprints" with each workout lasting just a few minutes.
James Timmons, Heriot-Watt University professor of exercise biology has studied the effects of quick exercise.
He recommends 4 x 30 second sprints on an exercise bike three times a week.
He said people could reduce their risk of diabetes and heart disease substantially with short, intense workouts – with such "time-efficient" exercising appealing to busy workers. […]
This involved the men going as fast as they could for 30 seconds and then taking a few minutes of complete rest between each sprint.
After two weeks, Prof Timmons said the results were "substantial", with a 23% improvement in insulin function.
While his research focused on young men, Prof Timmons said it would work for people of all ages and for both men and women.
He said: "This study looked at the way we break down stores of glycogen.
"Think about diabetes as being glucose circulating in the blood rather than stored in the muscles where it should be.
"If we take out the glycogen from the muscles through exercise, then the muscles draw in that excess glucose from the blood."
Exactly what I and others have been saying for a long time with respect to the GENE EXPRESSION benefits of HIT (high intensity training). This takes no time at all and is a lot of fun (sprinting in now my favorite, since I've retrained myself to run all-out at 48-yrs-old). And, if you can't run, you can use a stationary bike, but put a bit of resistance on it, and just go all out — everything you have.
And, as many have also been saying, chronic cardio gets you nowhere. It probably harms you.
He added: "If you go for a jog or a run you oxidise glycogen but you are not depleting the glycogen in your muscles.
"The only way to get to this glycogen is through very intense contractions of the muscles.
"If we can get people in their 20s, 30s and 40s doing these exercises twice a week then it could have a very dramatic effect on the future prevalence of diabetes."
He said the effects were bigger than the traditional "one hour of running per day".