How to find the gym
The front doors of the Mai Hing building are locked on Sundays and in the evenings.  Here is how you get to the gym.

Go down the small road running down the right hand side of the Mai Hing building.  At the end of this road on the left hand side you will see a ramp running up to the first floor of the building.  Go up this ramp and at the top turn left into an open yard.  On the right hand side you will see a large entrance into the building.  (There is often a security guard sitting near this entrance).

Go through this entrance and you will immediately see three lifts.  Take the passenger lift, (the one in the middle), up to the ninth floor.

Turn right out of the lift and the gym is in the first unit on the left.