Sienna Miller , 33 , is 'not a gym person ' but loves yoga . The actress has been seen in the past wearing black and white workout clothes with her hair pulled back into a ponytail while she works out at home on an elliptical machine. Try hip rolls , a Pilates move that targets the 'oblique ' abdominal muscles .
Sienna Miller , 33 , is 'not a gym person ' but loves yoga . Mother-of-one works with a personal trainer , power-walking and jogging . Try hip rolls , a Pilates move that targets the 'oblique ' abdominal muscles .