Craig Brown, 27, was arrested Friday night and charged with attacking the young woman in a basement of the Bally gym on Tilden Avenue in Flatbush.

The alleged attack comes four months after Brown's name surfaced in connection with a sexual-harassment lawsuit against Bally Total Fitness filed by a former assistant manager at the same gym.

In the Friday incident, officials said, the woman told cops she was working out on the main floor of the gym at about 8 p.m. when Brown told her "she had to stretch out first," and accompanied her to a basement room which has mats for stretching.

At that point, Brown pushed her onto a table, pulled down her pants and raped her, cops said.

The woman "repeatedly told him to stop," police said.

Cops said Brown had been acting as the woman's personal trainer. Brown, released Sunday on $5,000 bail, is charged with rape, sexual abuse and sexual misconduct.

Brown will plead not guilty at a hearing today in Brooklyn Criminal Court, his lawyer said. The muscular, 5-foot-11, 220-pound Brown, who is married and has children, was accused in documents - filed in connection with the sexual-harassment suit - of using the gym after hours as a place to have sex.

Kathryn Brennan, who was an assistant manager at the Tilden gym and another Bally gym in Bensonhurst, claims in the lawsuit that she was constantly subjected to "sexually offensive statements, overtures, and gestures to her and other female employees" by male co-workers.

In a December letter to Bally lawyer Earl Acquaviva arising from the lawsuit, Brennan accused Brown of using the gym after hours for sexual trysts.

"It is unfortunate that people were warned, but chose to turn a blind eye," Brennan told The Post. "This could have been avoided."

In a written statement, Bally said it was "saddened and concerned" about the alleged rape in its club.

Brown has been suspended without pay pending an investigation.