Lets assume she was at the beginning of the workout.
I'd rather assume she was sweating profusely, but OK I s'pose...
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Tangent that makes me sound even more of a degenerate (if that's possible)
In my gym a million years ago when I was a young stud, I had Competition Line benches. Not sure if it was the colour or the material, but I noticed that if a female sat on one of them briefly while working out intensely, she would often leave... er... well I suppose you could call it a sort of 'sexy imprint' when she stood up...
I'm already going to hell, so what's one more confession, right?