It's typically 350 kilometres. As you can imagine, there's a vacuum in space, but it is a very rarified environment up there. There is some drag that affects the station and it slowly creeps down over time. Every once in a while, we need to boost the station back up. The usual target is 350 kilometres.
Let me segue and tell you that I think, in addition to being scientific and technical role models, Canadian astronauts should be role models for physical fitness. About 25% of young Canadians are overweight or obese. We had a challenge called “get fit for space” associated with this expedition. We encouraged young Canadians and senior Canadians to walk, run, or cycle the 350 kilometres to the space station over that six-month period of time. We had 40,000 people participate. It was gratifying.