Interval Training Courtesy of Mircosoft Images An excerpt from Death of the Diet: “Interval training is an advanced, highly effective form of cardiovascular training. It involves brief bursts of higher-intensity work – anywhere from 15 to 60 seconds – followed by a recovery period. A classic example is to run or walk quickly for 30 seconds, then walk more slowly for 60 seconds, and repeat. The amount of time spent resting between high-intensity bursts usually starts at two or