She asked me if I work out a lot.... what does that mean?

So I was getting into work and I was taking off my jacket. My shirt got pulled up a little bit and my co-worker got a little flash of skin from me. Right after that she gave me kind of a cute look and a smile and said: "Do you work out a lot?" I kind of looked at her and just shrugged.

What does this mean? Is she attracted to me?
She asked me if I work out a lot.... what does that mean?
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