Olympus Gym
Sorry my instructions were wrong. Its not near the inter-section of Second Road and Sukumvit Road. Rather the junction of Central Pattaya Road and Suk Road.
I assume you know Central Road. This is the one which runs from 2nd Road at the Tops Supermarket. Where it hits Suk Road you turn left and go about 300 Yards. You will see a large statue of a muscle man. Turn into the forecourt and you will see a large building. The gym reception is on the ground floor and the gym on the 1st floor.
I'm hoping to be back in Pattaya in a month or so.
I often went to the gym in the morning and then in the afternoon I go to Dongtan Gay Beach.