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Want to run a 3:30 marathon? Then train to run a bunch of 800s in 3:30 each. Between the 800s, jog for the same number of minutes it took you to run your repeats. Training doesn't get any simpler than this, not on this planet or anywhere else in the solar system. Bart begins running his Yasso 800s a couple of months before his goal marathon. The first week he does four. On each subsequent week, he adds one more until he reaches 10. The last workout of Yasso 800s should be completed at least 10 days before your marathon, and 14 to 17 days would probably be better. The rest of the time, just do your normal marathon training, paying special attention to weekend long runs. Give yourself plenty of easy runs and maybe a day or two off during the week.

If I can get my 800s down to 2 minutes 50 seconds, I'm in 2:50 marathon shape. If I can get down to 2:40 (minuses), I can run a 2:40 marathon. I'm shooting for a 2:37 marathon right now, so I'm running my 800s in 2:37."

The adventures of Paul, Black and Breinan offer a glimpse into a forgotten aspect of the running boom of the late 1970s. Preternaturally self-disciplined, they were among about 75 children (ages 8 to 13) who tackled the early years of the New York City Marathon in a time of novelty and naïveté. Organizers were uneasy about young runners, but it was not until 1981, records show, that age 16 became the requirement. New York’s official minimum age became 18 in 1988, after an advisory set by the International Marathon Medical Directors Association in the early 1980s, and reasserted in 2001. With no conclusive study, physicians still debate risks to children who compete in marathons, like muscular-skeletal injuries, stunted growth, burnout, parental pressures and the ability to handle heat stress.

Some marathons — Houston and Twin Cities in Minnesota — allow teenagers or admit younger runners on a case-by-case basis. Los Angeles has a program for schoolchildren ages 12 to 18.

David Nieman, DrPH (photo above), and colleagues have shown that you DO burn a lot of calories after exercising, at least if you exercise at an intensity roughly equal to 70 percent of your vo2 max. That's a little slower than your marathon pace, but a little faster than your everyday EZ run pace.

In Nieman's study, a group of 10 healthy young-adult males (including three clinically obese subjects) burned 519 calories while exercising for 45 minutes on an exercise bike. Then, over the next 14 hours, they burned an additional 190 calories (above their normal calorie burn) while just sitting around.That's a 37 percent boost beyond the calories burned on the bikes. Another way of looking at it: If you burn 500 calories by running about 5 miles, you can gain almost another 2 miles of running through your after-burn calories. Thus, 5 miles becomes 7 miles, at least in terms of calorie-burning. That's great news for runners and other vigorous exercisers.

Running has continued to increase in popularity in the United States over the past decade. The number of finishers of United States marathons cracked the half-million mark for the first time in 2010, according to Running USA.

according to the American Academy of Physical Medicine & Rehabilitation, about 70 percent of all runners will be injured at one time during their running career.

The four most common running injuries that occur are iliotibial band syndrome, patellofemoral syndrome, Achilles tendinitis and plantar fasciitis.