I worked out at 24 Hr Fitness in Addison (now closed), but our class had group warm ups in the parking garage here. It’s 5 stories, so tons of stairs. We would run up and down the garage, which was around 2 miles. The gentle incline made the first half tough, and the decline was a nice break to finish.

There’s lots of parking garages in Plano as well, like Legacy East & West. Like Addison, they’re likely quite empty in the mornings and outside of the evening bustle. Just another option to consider outside of your typical stadium, which might be restricted for schools while they are in session. Good luck!