Duh, is this building on fire, or something?

My gym is a three story building, plus a cellar with showers and a sauna. Two, really, since men and women are segregated in this barbaric country. The first floor is reception, locker rooms, and a bar. Third floor holds all the abdominal machines, a couple other ones, and the massage room. The second floor is separated into two halves by the load-bearing wall, with about twelve cardio and weight machines on each side. You can barely see any of one side from the other; there are several openings but they're narrow. Today I was going to town on the stair master, which is practically in one of the corners of the second floor. I was listening to my mp3 player; finally I found a use for it since Christmas. For two months I was thinking, why did I buy myself that? Anywho, I couldn't hear anything besides the music and my own heartbeat. At one point I looked around and there was nobody else there. Where there had been four other exercise enthusiasts and one trainer a moment ago, there was now just some tumble weed, which was eery in itself.

I sniffed a bit, no sign of smoke. I decided that if there were a fire, I could bust open the door to the balcony with a barbell and climb down, even though at that point everybody would be watching me. Although, in that case everybody would be watching me, and the metal railing would be really cold so it would reduce my bulge. Maybe I should make sure there is no fire. I unplugged one of my earphone and holy shit! Sirens! I couldn't believe it! For about three seconds, and then the siren blended back into the song of which it was a part. I'm telling you, music these days: you don't know what's the music and what's a sound bite and what's a fire alarm.