Post-kid I was a 34DDD. I did not run...or do much of anything. They got in the way and were cumbersome. I would have had to wear 2 sports bras to even think about running...hell no.

Post-reduction I am a 34D (losing weight is gradually moving me into a 32D. Yay, neither of my favorite sports bras come in that size ). They are still cumbersome and I have often wondered what effect they have on my gait. That study really doesn't surprise me. There's a reason we don't see elite females who are leans, but with big busts (and these women do exist and not just from surgical enhancement...my boobs are the first place I gain and last place I lose).