How Does Your Time of the Month Affect Your Workouts?

I'm pretty lucky in the fact that when it's "that time of the month," my symptoms are fairly mild. I feel a little crampy, bloated, and tired, but it doesn't interfere with my life too much. Sticking to my regular exercise routine usually relieves any discomfort I have, and it always lifts my mood. I do wear a more supportive sports bra, since bouncing around and soreness don't mix. That's just me though. I know some women are so uncomfortable when Aunt Ruby comes calling, slipping on spandex and sneakers is the last thing on their mind. So what about you . . .