He's on a mission to get buff!

Rob Pattinson was snapped en route to the gym on Tuesday afternoon in a black Dodge Durango, and he's really trying to beef up for his role in Mission Blacklist. After his workout Rob headed to the grocery store, and this is the first time we've seen him since his reunion with ex-girlfriend Kristen Stewart last week.

K. Stew Kristen drove to Rob's home the day before Halloween, and they spent several hours together before leaving in separate cars. We're not sure if they were trying to reconcile or if they were just trying to get closure, but we're curious to see where this goes ... Robsten forever? It never ends!