You may need even less exercise (interval training) than you think, in order to lose weight. Michael Mosley M.D. has written a book suggesting 2 – 20 second intervals, 3 times a week, may provide significant health benfits for conditioning and weight loss. He calls it HIT or High Intensity Training, and his book is called FastExercise. The great thing about a 20 second interval, is that you don’t get the “I want to quit now” feeling, because it’s over so quickly. I like a Gazelle or an Elliptical for High Intensity Training, as you work out both upper and lower body.