What does in shape mean?

I recently met someone online. I asked him to describe the girl he is normally attracted to and he used the words "in shape". This is fairly vague to me. I play recreation sports several nights a week and I completed a half marathon... But I am not a size 6. What is considered in shape? Is it your size or bmi or what? Need a guys' opinion on this.
What does in shape mean?
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