Sandra Bullock Works it Out

Sandra Bullock works on her fitness at a private gym on Thursday (September 22) in West Hollywood, Calif.

The 47-year-old actress, who wore a black cami tank, leggings, and a cap, brought along a friend for her cardio session.

PHOTOS: Check out the latest pics of Sandra Bullock

The day before, Sandra donned a baseball cap as she entered a skin care treatment center in Los Angeles.

10+ pictures inside of Sandra Bullock heading into her private gym with a pal in West Hollywood…