Find any open field in a park or athletic field and try 50, 75, and 100-yard all-out wind sprints. After each sprint, rest long enough to catch your breath before the next one (generally 1-2 minutes). Try workouts of anywhere from 6 to 20 wind sprints for a great “cutting” workout. Also, if you have a hill nearby, hill sprints are also great workouts. Sprint up the hill as fast as you can and walk down for your rest interval. Repeat until you’re whooped. These sprint workouts are so amazingly effective at changing your entire body for the same reason as stairs exercises…by powerfully working the biggest muscle groups in your entire body, you greatly stimulate your metabolism while simultaneously increasing your fat burning and muscle building hormones.
Just look at any world class 100-meter sprinters and notice how ripped-to-shreds those guys are. Now compare that to the emaciated weakling physiques of many marathoners, and you’ll see that sprinting is where the action is at for a healthy, ripped, powerful body! Now I don’t want to upset all of you distance runners out there. Hey, if distance running is something you enjoy, then go right ahead. But don’t say you’re doing it for the health benefits, because I might just have to disagree. Section 2.1 in this book provided my full opinion on why I believe highly variable intensity exercise (such as sprinting and interval training) is far superior to steady state endurance exercise (such as jogging, endurance cycling, or any same-pace cardio).
Body Muscle Workout Guide 