The January Gym is an overcrowded asses to elbows hell rush to wellness. A once-a-year event. It will swell with flesh again shortly ahead of summer, but this month, this now, this new year beginning is stand alone.   Everything reeks of resolution and self-loathing. New faces in new clothes staining in the sweat of want and willpower and wonderings of reshaping shapes mocking in mirrors since the holiday binge.   The November gym was busy, though swathes of open space brough