Forget Jazzercise, Tae Bo, Pilates, Hot Yoga, Hawaii Chair, Boot Camp, P90X, 8 Minute Abs, NordicTrac, Tony Little’s Gazelle, Aqua Zumba, Extreme Scrabble, Suzanne Somers Thighmaster, Spinning, Speed Walking, or any of the other fitness crazes of recent times. Since the legwarmers are already retro (NBA guys are wearing them on their arms these days), we know for certain that good old, plain Eighties-Style Aerobics will be retro.