Used the gym here a few times. Fitness first or (FF) for short's branch at cathay is a bit small , although very centrally located. It is about a 7mins walk from Dhoby Ghaut Mrt. Similar machines to other FFs but basically a little smaller. Try to avoid going during peak hours (weekends and after work timing). Facilities are good enough, with a small free weights area with enough dumbells and free weights for a good workout.