John M. Guzy, 56, of Bainbridge, was taken into custody and charged with second-degree murder in the shooting death of 26-year-old Derek D. Prindle of Afton.  The incident occurred at about 1:30 p.m. at Peak Fitness on Route 7 in Bainbridge on Monday.  Derek S. Prindle, 60, of Afton is being treated at UHS Wilson Regional Medical Center for a gunshot wound.   Guzy was arraigned in Town of Bainbridge Court and remanded to the Chenango County Jail.