Sienna 1 , 33 , is ' not a gym ##nast ' but loves gymnastics . best - of - one works with a personal trainer , power - walking and jogging . Try leg rolls , a Pilates technique 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 .