burrito, when it comes to body-type i'm in the same boat as you: i was a runner in hs and now i ride, and i've always had toned legs but no definition in my stomach. there are probably all kinds of different reasons for that, and eating better, core exercises and training are both great starts, but don't take it personally if your abs are not rock-hard. try to get confidence from passing people on climbs and in straight aways and you might notice that "pinch" fade away.