we reveal how to get the enviable physiques of the stars this week: sienna miller's waist judging by her tiny waist, sienna miller works at maintaining her shape sienna miller s a yoga fan   her mother started one of the first london yoga schools in the seventies  yet despite being 'very sporty at school', the actress says she's 'not a gym person' but the mother of one is a yoga fan   her mother started one of the first london yoga schools in the seventies sienna also works with a personal trainer, power walking and jogging around her local park and using light weights to tone muscles what to try:  hip rolls, a pilates move that targets the 'oblique' abdominal muscles around the waist lie on your back, knees bent and feet flat on floor, hip width apart take arms out to sides at shoulder height, palms facing upwards slowly roll knees to right side, taking head gently to the left turn left palm down, keeping shoulder blade anchored to the floor engage abdominal muscles and return knees to the centre turn your palm back up and repeat on the other side do this ten times the slim actress also works with a personal trainer, power walking and jogging around her local park 
sienna miller pilates
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 