Isla Fisher looked incredible as she slipped into a plunging black swimsuit for a sun-soaked day by the pool. Sharing a series of images from the outing on Instagram, Isla appeared in high spirits as she sat cross-legged beside the pool, with her red hair swept into a relaxed updo. © Instagram Isla looks incredible in the plunging black swimsuitThe actress kept her poolside look effortlessly simple, accessorising with delicate jewellery while the plunging neckline and spaghetti straps of her swimsuit put the focus firmly on her sculpted figure. © Instagram Isla also posted a selfie with a 'do not disturb' capHow Isla Fisher stays fit at 50Isla's fitness routine combines cardiovascular exercise with a strong focus on flexibility and the mind-body connection. Isla Fisher's workoutsIsla has also been a fan of the Tracy Anderson Method, the celebrity-loved workout created by trainer Tracy Anderson.