Barry Bonds' personal trainer was held in contempt of court and ordered to prison Wednesday for refusing to testify to the federal grand jury investigating the San Francisco Giants' slugger for perjury. Greg Anderson, who served three months in prison after pleading guilty last year for his role in the Bay Area Laboratory Co-Operative steroid scandal, was led out of U.S. District Judge William Alsup's courtroom by two deputy U.S. marshals. He will be housed at a federal prison in nearby Dublin.