The definition of "hybrid" has been discussed on this forum ad nauseum, and will long continue to be a subject of debate, I'm sure. When I bought my Schwinn it was marketed as a hybrid, which I understood to be a bike with a MTB frame and components mounted on 700c (road-bike) wheels. That is still how I think of it, but I also accept that any bike can be "hybridized" by switching components (e.g., putting drop bars on a MTB). To me the terms "fitness hybrid" and "performance hybrid" are interchangeable and again are marketing terms used to describe a bike with a MTB-like frame and road-like wheels, only this time the gearing is more performance (i.e., road) oriented. Even though my Norco has an IGH I still consider it to be a performance hybrid, mostly due to the fact that it can ride circles around my Schwinn, which I consider to be a "comfort" hybrid. The Norco's riding position is more aggressive, the OE tires are narrower, the bike is lighter, and it just handles better and reacts more quickly to rider input than does my Schwinn. The term hybrid is used very loosely both on these forums and in the cycling industry. That, in part, is what makes them so versatile; they cover a large range of uses.

Just my two cents, FWIW.