What does having a "compact body" mean?

I've been told by some people that I'm short and petite, but I also hear the term "compact body" thrown around a lot. Just wondering what that means because I've always had an average build and shorter than average height? :) Please describe what this means and is it an insult or a compliment? Lol :) Thanks in advance everyone!
What does having a "compact body" mean?
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