What discipline? Büyükşehir Belediyesi Spor Merkezi (Gültepe) in Mahmudiye is built around a specific sport or format, and that decides what equipment and space you'll actually find inside. How do you get in? Some places run on monthly memberships, others charge per session or per hour — worth checking before you show up expecting one or the other. Is coaching included? Depends entirely on the setup; ask rather than assume.