By Tanith Carey for the Daily Mail. Breasts have always been a source of fascination - for both men and women.
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And as a smart bra launches - which includes skin sensors to measure size, breathing and Women jiggling - science is finally shining a light on their charms. Women jiggling how breasts move to why you should wear a bra in the swimming pool, here's the surprising science behind your breasts - and how to keep them healthy and well-supported.
With each step a woman takes, her breasts move an average of 9 cm - not just up and down, but Women jiggling to side. With each step a woman takes, her breasts move an average of 9 cm - not just up and down, but also sideways - in a figure of eight motion.
When she breaks into a run, they move up to 15 cm with each stride, if unconstrained by a bra.
This means that during a 1 km jog of 1, steps, the breasts of an average C-cup sized women will have independently travelled as much as 0. Furthermore, each breast will have its own movement pattern - and Women jiggling travel further the older she gets, as elasticity in skin starts to decline.
Women jiggling study by Portsmouth University's Research Group in Breast Health - which uses sensors and 3D scanning software to analyse breast motion - monitored the bosoms of two sets of women, aged 18 to 25 and 45 to 65, during brisk walks. They found that while the young women's breasts mainly moved up and down, the older group's chests moved more in all directions.
Professor Joanna Scurr, a world expert in breast bio-mechanics, said: You will tend to see a more U-shaped swing. Women jiggling
Bra sizes are notoriously inaccurate and researchers say it's more effective to measure breasts in water. Bra sizes are notoriously inaccurate. In fact, researchers at Australia's University of Wollongong say cup sizes are so unreliable that bra-fitters measuring the same woman get different results depending on whether she is standing or lying down, breathing in or out or has her hands in the air or by Women jiggling sides.
Instead, a more accurate way to gauge size is volume - with some scientists saying that bras should come in millilitre measurements to estimate precisely how much they need to contain. When the Australian researchers placed breasts in water to get a better estimate, based on the fluid they displaced, they found Women jiggling average breast has Women jiggling volume of around ml - about the same as a large bottle of beer.
The shape of a woman's breasts is mainly dictated by the proportions of fat and glandular tissue they contain. Even within cups of the same size, these proportions vary. Some women with the same breast size may have as little as 20 per cent fat or as much as 80 per cent.