Cheer up Christine, it's going to cool off this weekend and get back to more normal seasonal temperatures (I'm in Oakville)
How getting out in the morning, just get up a half hour earlier and do that? That's something I'm going to start doing this summer to get a walk in every day. When I lived in downtown Toronto that's what I did almost every day. When I moved to the west end I worked in the Parkdale area so I walked to work across High Park and that definitely got the exercise in.
I do karate 3 days a week and the dojo I go to is in a basement and believe me, it's nice and cool down there. It's going to be wonderful in the summer