10:14 PM EDT, April 21, 2010
WESTWOOD -- A well-known personal trainer to the stars is accused of sexually assaulting a young woman. Police believe there may be more victims.
Gregory Isaacs, 49, of Malibu, was arrested in January for the sexual assault of a 27-year-old female Westwood resident. Detectives say the victim was sexually assaulted inside the gym at her apartment complex. Isaacs worked at the complex and was in charge of its workout facility.
Isaacs is a professional trainer whose website advertises weekend training retreats and the training of actors to prepare them for acting roles. His former clients include Melanie Griffith, Clint Eastwood and Goldie Hawn.
Isaacs is also the author of "Ultimate Lean Routine," a work-out book featuring his weight-loss program that is endorsed by many Hollywood stars.