Sandra Bullock Hits Gym in Hollywood (PHOTOS)

Little Louis
See all the adorable faces of Sandra's main man!
A super slim Sandra Bullock stepped out of a private Hollywood gym on Thursday, showing off her guns. Dressed in a black tank-top, black hat and tight workout pants, the actress’ arms were looking super muscular as she smiled and chatted with a friend. 

The two reportedly had just finished up a cardio class. Unfortunately, Louis Bullock was not with her mom for the workout, but they have been out and about all summer!

Most recently we spotted the mother-son duo at LAX.