I was so optimistic about this bra due to the reviews by seemingly large chested, active women. I would NOT recommend this bra for medium to high impact activity. This is a good bra for yoga, not for running. After purchasing these bras, I went onto Victoria's Secret's website during their sale, and purchased sports bras from them, and am way happier with those. I am not expecting magic, but I also don't want my breasts to hit me in the face when I run.