"Thanks for your great site and tips on interval training. It’s amazing. I have been doing the 4:3:2: running as you recommend for about a month and it has made more difference to my weight/figure/energy levels/endorphin highs than 6 months of steadily plodding between 4 and 6 miles around the local lanes. And the great thing is I only need 20 minutes to do this and that is not so hard to find in the day is it?"  Find out how here...