I have pretty large breasts.. I usually stick to lower impact cardio because of them bouncing around and I've never been able to find a sports bra that actually keeps them somewhat in place. I can usually only find ones that say "one size fits most" or I'll find one that's got the cup size right, and its somewhat right around but the straps are too loose and it doesn't help with the bounciness. I've even gone so far as wearing a regular bra underneath a sports bra but that doesn't help either I'm getting bored with my workouts and I want to step it up a bit. I want to jump around and have fun.. But lets just say the last time I tried to do jumping jacks I got smacked in the face, and when they bounce back down its painful. I need something that's actually going to hold me in place, and I don't know where or how to shop for a sports bra properly.