The Hanna-Barbera Workout By Jerry Beck on Thursday April 19, 2007 5:10 pm Comments Tweet 3400 Cahuenga Blvd. Thursday, 4.19.07, 2:40pm I was driving south on Cahuenga this afternoon and snapped this pic from my moving car with my cell phone. The signage was just erected. It’s official: The former Hanna-Barbera Studio is now an LA Fitness location. Very depressing.