Sandra Bullock wore a spaghetti-strap tank top yesterday to hit the gym in LA. She's been dedicated to her fitness regimen this week ever since returning from an out-of-town trip. Sandra and her son Louis Bullock headed off for a few days away last weekend, but they're now back at their West Coast home base. The actress has a few months to hang out before her next movie, Extremely Loud and Incredibly Close, hits theaters in January. She's spending lots of time with her best bud Ryan Reynolds, but he's currently out East filming. Ryan had a lunch date with Olivia Wilde recently, though, making it seem even less likely than before that he and Sandra are anything more than great friends.