Reason 32467865 why I need a treadmill

I was at the gym last night and only had 30 mins. Because I am running a half marathon the 22nd I NEEDED to spend that 30 mins on a treadmill. Of course when I got there there was only one treadmill open. So despite the fact I needed to pee, I jumped on the treadmill before someone else could. By the end of the 30 mins I felt like I was going to explode!😑