There is a place called O2 (As in Oxygen) in Garhoud. It is opposite to Choithram supermarket in a nice Villa.
They offer you a good Thai massage. If you are well-built / big made, please ask for Big Mama. She is a lady around 50, with very strong hands and loads of experience. She does a fantastic job. It is owned by a nice local genteleman called Hareb Lootah who frequents Ramada.
The rates are very reasonable. All the best
Mahesh