The road to recovery is proving to be an arduous and confusing one for CrossFit coach Kerrie Olsen after she suffered a traumatic brain injury in a golf cart crash last month. “Brain injuries are hard,” Olsen’s sister, Heidi Gustavson, shared via Facebook on Tuesday, May 19. “They are heartbreaking and terrible. Yesterday [Olsen] worked so hard on her new rehabilitation floor and crushed the therapy, but it was also a very hard day. As her sist…