Jessica Alba, the film actress, has the ultimate sexy strut, according to a team of Cambridge mathematicians. Jessica Alba's waist:hip ratio gives her a sexy walk The academics found that it is the ratio between hips and waist that puts the sway into a woman's walk - and the nearer that ratio is to 0.7, the better. This ratio provides the body with the right torso strength to produce a more angular swing and bounce to the hips during the walking motion. Therefore, a woman with a 25in waist and 36in hips would have just the right proportions to carry...