Hi, I'm "Penguin" Pete Trbovich, and last I checked, I weigh about 260 pounds. Considering that I only stand about five foot ten, that puts me in the Body Mass Index bracket roughly equivalent to Jabba the Hutt, or just your typical American bucket of lard. News reports the world over agree that Americans as a nation are on average blubbery landwhales. Gosh, what could be the cause of it?  Well, in my case, exercise is a factor. I write for a living. That involves (a) typing, and (b) sitting still for long periods of time. Even if I sprang out of my chair for a set of jumping jacks in between each paragraph, I would not be able to keep up on exercise, and I'd also have to explain to my hourly clients why I'm billing by the hour for jumping-jack time. I can mow the lawn and hike up the bike trail all I want to - Iowa life provides infinite opportunities for healthy outdoor exercise - but there just isn't enough hours in a day to compensate for basically being a professional couch potato.  …