So you've heard of mileage running - booking multi-city marathon trips on an airline or airline partner to take advantage of fare sales and pricing in order to get the most number of mileage points per cent. It's something that I have toyed with trying - it's basically a game, a puzzle.

But then there's mattress running. That sounds a lot more fun, to me - sleeping in some featherbed at a Starwood hotel rather than crammed on an airplane for 18 hours. And potentially sexier, if done with a special friend.