Every day on my way to work I pass a gym. This gym has big windows so everyone can see out and we can see in. Every morning I watch all the little mice on their treadmills running to get nowhere. Now I have nothing against treadmills, except for the fact that they suck your soul out of you. After all, they are a tool like anything else and can be helpful when used properly. But what I don't understand is why someone would want to pound away on a spinning rubber mat surrounded by sweaty people who all have headphones on and are doing their best to ignore you? Sure, if it's raining or snowing or cold or too hot, ok, I get it. But when it is 60 degrees out and the sun is rising over the harbor and the streets are quiet? Why are you trying so hard to remove all of the fun out of running? Go outside!
As I said, I will give some leeway if the weather sucks; to each their own. Some people just don't want to run in crappy weather. There are also sometimes when there are circumstances where your only choices are treadmill or not running. If you find yourself in that dilemma go ahead and run on a treadmill. Otherwise treadmills should only be used for one purpose and one purpose only; to dance!