Just putting this out there for anyone with a long/overnight layover at YYZ -- I used the Goodlife Fitness in Terminal 1. It's landside, so you do have to enter Canada, but it was a surprisingly great break from traveling, and I felt much better afterward. It's a 10,000 square foot gym (not what you'd see in a hotel -- much bigger) with actual showers and actual locker room facilities. There are also recliners to relax in, and a big enough place to store your luggage securely. Well worth the 25 CAD fee -- you can rent shoes and clothes for another 20 CAD, too. Open 5a - 10p.