Stadium workout suggestions?

While on a work trip, I developed a taste for stadium workouts and it is an almost immediate addiction.

Guidance would be helpful in two fronts: what are the practical restrictions of using the stands at DCPS facilities. I am very close to McKinley High School field but it is always unclear to me when during the school year it is appropriate for the public to use the track, therefore, the stands.

Second, are there other public or private facilities open to the public that I am not aware of? I can’t imagine that Nations Park allows public access but are there other facilities that might not immediately occur to me?

Thank you!