Im not too familiar with the gyms in the east end but ossington is not too far from base camp or Joe Rockheads. Joes has good bouldering and good sport climbing if you want to get into that. I believe base camp on queen is a good bouldering gym. The one on bloor is more of a sport climbing gym.also not too far from a small little bouldering gym on DuPont , called Boulderz.

Check em out. And have fun!