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…