Instead of getting fed up of men looking down your tops or just generally staring at your boobs. Just take control of the situation and bare your breasts there and then, if you do this enough, the men will eventually get fed up of the things, problem sorted!
And yes ... containment is the issue. Personally, I wear a Nell McAndrew bra, designed for dancers. But ladies who work out need to wear something to hold themselves properly in place.