It's a local high school so you would ask permission at the local or regional board of education. They are the ones that make policy. But I doubt you will get permission.
While you may not have found any signs at the track/field, I would almost guarantee there are no trespassing sign at the entrances to the property. If your business is not related to school activity you have no business being on the property.
Buy a treadmill.![]()

