The Treadmill and an iPod

I have not been keeping track of how many miles I run each week. Last night I ran 7 miles in 71 minutes and gained 600 (do not know what it means) in elevation. I had not used a treadmill for running or walking until about a month ago, but it has become one of my favorite workout routine in 24 Hour Fitness.
I started running after a 20 year hiatus at the beginning of this year. I started training for a 5K event where I work and now I am running regularly in the gym and sometimes around Town Lake in Austin. I love running on the treadmill listening to music on my iPod.