What is by definition a hardbody?

[snaptrap]

Can someone tell me if there is a straight definition to "hardbody"? When does a woman have a hardbody? My English is good, but not that good. What I used to thought is that a hardbody is; A woman's body who's skin is so tight, that it's very hard to squeeze her rounded parts; ass, hips, thighs, belly and breasts. (And because she's bending over or stretching anything.) And it doesn't matter how tall or small she is, or how tall or small parts of her body are. As long as they can't be squeezed easily. Though younger / thinner women have a chance of having a hardbody, than older / fatter woman.

By this definition I find the following examples hardbodies. Or at least they have in the screenshots: Jasmine Tame, Krystal Steal, Sandra Parker
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And the following examples not: Carmella Bing, Morgan Layne;
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And then Lucy Wilde is debatable, her body is hard, but her tits aint;
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I'd also like to point out that this topic doesn't have anything to do with if hardbodies are by definition all hot, and women without hardbodies aren't.