The sports bra is a very key part in the new years resolution of getting fit. I have seen some very crazy things at the gym, on the running trail, and at the yoga studio when it come to sports bras. I have seen the double up, sometime a triple. The built in bra top layered with a bra, and the not nearly enough support for a child. So to pick out the right sports bra you have many great option in tackling this beast. One is to go to a real lingerie store and get fitted. If you have extra large tots I recommend this option. Also stores that specialize in big boobs bras will likely have a selection of sports bras that branch out from typical brands. Second If you have to wear more than one you are not in the right fit or style of sports bra. Sports bras are designed for specific exercises. Buy the one for that exercise or impact level. Third if you buy a built in bra tank and still feel that you need more support do not buy that tank.
From my experience, I know I work out a lot. I have been employed by lingerie stores, and athletic wear companies I run marathons. Check out lululemon if you are of the small to medium tot variety and are into yoga or running, and like a pullover your head bra. If you have medium to large tots try Victoria Secret they offer front closure options that are easier to get on and off of sweaty tots. For the large to extra large totted ladies try Panache or Freya.