This bra was comfortable once it was on, but it was difficult to hold myself in place and zip it up.  I never actually got a chance to exercise in it, because I returned it.  A very friendly Moving Comfort rep recommended this bra for nursing mothers.  I can see that it should work in theory (partially unzip for nursing), but it was no good for me.  Once I unzipped the bra far enough to allow access for nursing, the force of my D/DD chest caused the zip to open completely, and each side of the bra ended up under my arms.  Perhaps it would work for a smaller cupsize.