Are you and a friend or loved one in need of some self-reduction? Wanna do it on a major network TV reality show? Then show up at Chicago Home Fitness at 1555 N. Halsted tomorrow, Feb. 16 between 10 a.m. and 6 p.m. and try out for NBC's The Biggest Loser. Come early: This ad from casting call hosts BL4 Productions Inc. promises that the first 500 people in line will be seen, but latecomers might have to settle for listening to their iPods on the nearest treadmill.