When I finished, I washed my hands, and taking advantage of the fact that I was alone there, I decided to take off my shirt and show my good body to take a photo that I would publish on my instagram. As I did, I thought I heard a laugh or something, but when I entered, the bathroom was empty, maybe my mind just trolled me.
As soon as I finished my exercise routine at the gym, I went to the bathroom to urinate.