The Engelsby and Friedheim gyms date back to the 1960s and are to be extensively modernised. In this context, the halls are not only optimised for energy efficiency, but also repaired and barrier-free. In addition to the “Guideline on the Granting of Grants for Projects for Energy Optimisation of Public Infrastructures in the Framework of Sustainable Urban Development (Sustainable Urban Development – the Energy-Efficient City)” of 19. Oct. In 2016, the project was additionally funded with state funding from the MILIG within the framework of the Sports Facilities Directive of the Ministry of Interior.