My wife and I decided to go to our local rec center due to really smoggy air outside. She walked for about 1.5 miles, and I ran for about 2 miles. The indoor track is small is about 0.1 miles long. I much prefer being outside, but winter months in northern Utah are full of bad air. The Salt Lake valley has a lot of temperature inversions, the result being bad air.
I would have liked to have ridden the Expresso bike, but it was being used by another person. We went to the rec center in the morning so we would miss the students who come after school. The center was still busy, though.