Every Monday and Wednesday at 5:30 p.m., Brian Gadson breezes into the upstairs aerobics studio at the Central City YMCA, greets folks with a high-watt smile, kibitzes, teases, picks out some music and starts leading the class with a simple march in place. It only gets better from there. Brian is part dance instructor, part playful drill sergeant, and (big) part friend. You CANNOT help but feel good after going through Brians hour, which includes about 45 minutes of cardio and 15 of floor exercise. He makes it fun and a bit competitive if you want it. A lot of exercise teachers can take you through the motions; it takes a gifted one to make a simple hour of moving around a special experience. And lets give a little shout-out to the class regulars Kim, Ovetta, Mary, Carolyn and the rest. They definitely help keep the energy (and good times) at a high ebb. 110 E. Palm Ave. Tampa, 813-229-9622.