Mildly infuriating.

I go to the gym the last hour and a half they're open because it's slow, I like ending my day with a workout, it really brings me into the present and the rest of the world melts away. I do this because most, if not all the treadmills are open. But tell me why, every. Single. Time. I start my cardio session, and someone comes and gets on the one right next to me, when there are like 20 open ones. It's so frustrating and annoying. Yesterday I just stopped mid jog and moved to another one.