Errol M.
Yelp
For cardio, I walk, not run, only because I've never heard of anyone keeling over from cardiac arrest during a walking workout. I also don't like being distracted or bothered when I do my daily miles. For me, the very best place in Austin to do serious walking is the Camp Mabry track.
You can see the track from Mopac by glancing west between the 35th and 45th St. exits; it's that expanse of area with planes and helicopters all neatly lined up and lit up at night. It's exactly one-mile of light gravel and cinder with quarter-mile posts--I know the distances are accurate because I measured them. There are also exercise-stations all around the track with incline benches and bars and instructions on how to use them, if that interests you. The track has a large parking lot and a small bathroom where you can change.
Camp Mabry is a military post, but normal people can use the track--just tell the guards at the 35th St. entrance why you're there, show some id, and be prepared to open your trunk. You'll get a yellow temporary permit for your car.
I don't know what the deal is on the property here, but it sure doesn't feel like being in the middle of Austin: You must drive slowly and carefully, especially during dusk and dawn, to accommodate all the does and fawns and raccoons and coyotes that will cross your path. It's actually pretty cool. At twilight, there's usually a herd of deer grazing as I'm driving out.
I've noticed Army people do early morning workouts, so if I'm there when they are, I just stay on the right-hand side of the track and they'll zip past me on the left--just like driving. On weekend mornings, I see Navy people. From 6:00pm on, I rarely see more than two people using the place at all. Incidentally, it's worth bringing your own water and not rely on the water fountains at the two gazebos.
One last thing--every once in a while when I'm there, a helicopter will swoop down and land in the middle of the track and after a short while take off again. For some reason, that just fascinates me.
It occurs to me this place is some kind of hidden gem that I shouldn't be talking about, and those in the know probably want it sequestered; if that's the case, I'll consider deleting this review. Then again, maybe not.
************************
January 2015 Update - "The new track is here! The new track is here!"