It's called "Masking"

[Midwest Spy]

Yeah, I actually try not to be too obvious when my gaze might linger a little longer than it should.

Women at the gym these days definitely dress to impress. Seems most of them want people to notice what their hard work has produced.

I think as long as you aren't approaching them or standing directly in front of them and staring, that it's all pretty harmless.