I got up this morning to go for a run, and somehow managed to put on a normal bra instead of a sports bra. Didn't realize it until I'd walked to the park 10 minutes away from home where I run. I started a light jog and then wow...instant flashback to high school PE. I totally remember why I used to hate running, you guys! Not only is it uncomfortable, I am convinced that running without a sports bra alters my running form. You just try efficiently converting force into forward motion when you've got stuff flopping around up front. It doesn't work!
I stuck it out for a short interval workout, but I am never doing that again. The Nike Victory bra: don't leave home without it.
(You know, they must have had sports bras when I was in junior high and high school. Why did it never occur to anyone to suggest to me that I'd be more comfortable with more support? Then again, they also made us work out in cotton T-shirts in Florida weather, which suggests that comfort was not high on anyone's list of priorities.)