Rebel Wilson appeared to be ready to hit the gym on Saturday as she shared an inspirational post with fans.Taking a mirror selfie, Rebel rocked a pair of skintight black leggings and a black crop top, proudly showing off her body."Let's go Saturday!" she captioned the Instagram Story, taken in what appeared to be a hotel room.MORE: Rebel Wilson is a summer star in brand new swimsuit snapshotWATCH: Rebel WIlson works up a sweat in unexpected mesh outfit on set of her new movieThe actress has been