Being a big runner means that a good sports bra is mandatory. I have spent years trying to find a bra that actually held everything in place (without needing to double up). So far the best bra I have found is the Yvette Sports Bra. The front zipper makes it easier to get in and out of (without having to dislocate your shoulder first), although you do have to muscle yourself in a bit. I found that the bra fit on the small side so suggest going up a size from what you would regularly buy.