I run on the treadmill on my lunch hour because the temperature is a controlled 68 degrees in our work gym, and I like to wear shorts and a tank top. Outside, it's often either too miserably hot/humid (I live in NC, after all) or cold, which would require bringing in all sorts of different clothes/layers to see what works. That just gets a bit too complicated when I only have an hour during my work day. The treadmill just simplifies it for me during the week. At home when the weather is nice, I will run on the trails after work (when it's light out) or on weekends, and I enjoy that, but the ground is uneven, and there are hills, so it's definitely a much harder workout than the treadmill, but definitely more interesting! When I want a more moderate, controlled workout in a predictable temperature, though, the treadmill provides that.

Just some rambling thoughts from this not really a runner person!

Emily