Practice in the tournament venue is possible on Wednesday afternoon; you can find the practice schedule here.
Practice from Thursday to Sunday is only possible before matches start (08:00-08:30 on Thu/Fri and 08:30-09:30 on Sat/Sun) and after matches end (at most until 21:00) on a first-come-first-serve basis.
More practice courts are available for rent at Attention Badmintoncenter
(Koßgasse 10, 8010 Graz) the whole time.
You can check here for availability and call +43 316 473032 for costs and reservations.
The official hotel Augarten Art Hotel has its own gym and wellness area.
There is an avordable FITINN gym nearby (Stadionplatz 1, 8041 Graz); daily entry is 15,90 € and you can get there by tram line 4 from Finanzamt or Jakominigürtel to Stadion Liebenau.
The more exclusive Merkur Gym (Conrad-von-Hötzendorf-Straße 84, 8010 Graz) can be reached by foot; daily entry is 29 € and it includes a wellness area.
The gym at the tounament venue is privately owned and can not be used!