Fitstop @ Bishan is listed as a muay thai boxing gym at 7 Bishan Street 14, Bishan, Singapore. It holds a 5.0 rating from 1 Google review.
A good muay thai gym is judged first on the coaching and on how carefully beginners are brought in. Before any pad work or sparring, a sensible coach teaches stance, footwork, shin conditioning and basic clinch safely, and matches partners by size and experience. Watch a class before you join, and notice whether the instructors explain each drill and correct form. Many regulars find that the first few months are about technique and fitness, not fighting, so it helps to set that expectation early. Ask about the contract terms, the gear you need to buy, and how classes are booked.
Bishan is a mature residential town with parks, the MRT interchange and many housing blocks nearby, so a gym here suits people who train close to home or after work. For anyone in the neighbourhood, Fitstop at Bishan Street 14 is worth a visit to see whether its classes suit your level and goals.