I did a 2hr 15 min increasing interval workout on a treadmill last week. Normally, I would rather run on cut glass than get on a treadmill, but it was raining and cold outside.
I made sure I got the ones in front of the TV line so that it wouldn't bother me. I don't see how people can watch TV and stuff like that when they are suppose to be running. But it is super boring in general.
And I actually have more pain in my legs after running on a treadmill than if I run outside. It is good for speed work, even if it only goes up to 10 mph. That's what the incline is for.
Owner/Head Coach for Endurance Concepts
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