The gym at Walkerville Collegiate Institute is at the back of the building and has its own entrance you do NOT go through the main doors at the front of the school. 

To get to the gym follow the yellow arrows and enter from either Devonshire Road or Monmouth Road. We would advise entering via Devonshire road as the road is wider and easier to find. The entrance to the gym is marked on the picture below by the red arrow there are double doors you will open and go up the stairs to the gym.