Mandy Ingber says Jennifer Aniston "is in amazing shape all the time," but when she is preparing for a romantic trip like the one she is on with fiance Justin Theroux in Bora Bora, there are a couple things she does to "tighten up." Aniston and Theroux recently jetted off to the tropical destination to celebrate the two-year anniversary of their engagement and Theroux's 43rd birthday. Ingber has a slew of celebrity clients who come to the renowned yoga instructor to get an amazing body like Ansiton, 45.