OK to start with I know I'm being a bit U but I need to have a mini-rant.
I use currently use the gym mainly for running intervals and speedier sessions which are easier to manage indoors.
Every time I go in all the treadmills are taken, and mostly by people walking.
Now I can totally understand that people have different fitness levels, might be using the treadmill to warm up or for recovery and that's absolutely fine.
But there seems to a growing number of people (actually, exclusively younger women in my observation) just using the treadmills for a gentle stroll while messing around on their phones.
I ended up next to a young woman last night who spent the entire half hour I was on the neighbouring treadmill walking at 3kph, no incline, while scrolling instagram. I can barely call that exercise, it's below a normal walking pace. If that's how you want to kill time then I guess it's up to you but it just seems selfish when there's a queue of people waiting for a treadmill.