I am a 32DD and a runner.  This bra is excellent for high impact exercise. A lot of bras say that but this one fits the bill.  I generally have a difficult time finding sports bras that fit well.  This one works really well.  The only issue is the strap.  Adjusting the fit of the strap can cause bunching in an uncomfortable area.  I've found that once the I have a fit that works, adjusting before I start to sweat prevents most of this discomfort.  This issue is not enough of a downside to avoid this bra.  The is almost no bouncing even during the hardest sprints.