Often, the way we work out, it’s almost as if it could have an invisible meridian dividing the upper and lower halves (you know: arm day! leg day!). But central, quite literally, to everything is the ...

But often, whether it's pulling on jeans or wearing a swimsuit, sucking it in is all we've got. And we all know how effective that is. With diligent work, though, you can strengthen and flatten those ...