Support in bras is oh so important.
Did you know:
That a pair of D-cup boobs weigh in at 7 to 10kg. “That’s more than enough to pull your trunk forward, force you into a hunched-over running posture, decrease your stride’s efficiency, and up your risk of injury,” McGhee says.
If you haven’t noticed, pretty much the only thing keeping your breasts up during a run is your bra’s shoulder straps, which take a lot of weight. When straps are thin, the pressure can be so great they not only leave dents in your shoulders but hit the brachial plexus nerve group, causing numbness in the pinky fingers.
We recommend a razor back or full back and should support for high-intensity exercise.
How much your boobs bounce depends almost entirely on breast size and elasticity of the skin covering your breasts, McGhee says. However, skin tends to lose its elasticity with age and “excessive breast bouncing.” So, the more your breasts bounce, the more they will bounce during future runs. Add in breastfeeding or post breastfeeding and your lady friends could be dragging on thin ice mid run….
How much do breasts bounce? Measuring the bounce of both bare and bra-covered breasts during treadmill workouts, McGhee found the average 38D moves about 13cm from top to bottom during running. Smaller breasts bounce about 7.5cm, which can still be uncomfortable. And breasts don't just bounce in an up and down motion; some larger breasts bounce in figure-eight shapes.
While they can’t completely eliminate bouncing, high-support sports bras can cut the range of motion in half (approximately), McGhee says. The goal is for the breasts to move in unison with your torso and not bounce independently of one another.
During pregnancy there is evermore of a concern. When you're pregnant, your body has very high levels of oestrogen and progesterone, hormones that stimulate your breasts' milk glands and milk ducts, respectively. The result of all this can be a big change in bra size, but growth usually slows or stops at the end of the first trimester. No special foods, massages, exercises, or creams affect breast growth during pregnancy, so spend your money on a good supportive bra instead.