Mrs Toque and I went dog-sledding on Spray Lakes the other day. Physical exercise in minus 20 temperatures, at altitude, and dressed like the Michelin man is hard work, but I recommend this to anyone - you can always just sit in the sled and let others do the work. However, if you're not the one in the sled then you should be prepared to run alongside the sled, uphill through snow, in heavy snow boots, to help the dogs out. Did I feel it in my legs the next day? Err...Yes.