Sweat, disinfectant, rubber — the smell every gym seems to share. İstanbul Büyükşehir Belediyesi Müjdat Gürsu Spor Tesisi in Silivri adds its own soundtrack on top: clanking equipment, footsteps on a treadmill, a trainer calling out reps, sometimes music. Open floor or closed room, packed or nearly empty — these details finish the picture and shape whether the habit sticks.