Wii Fit is set to become the fastest selling Wii game ever. It’s outdone all previous records on Play.com by selling out its entire allocation in just one day. Wii Fit will be launching in the UK on April 25 and according to Play.com they have been “overwhelmed” by demand for the new game that isn’t really a game, but rather a fitness aid.

When it debuted in Japan 4 months ago, the exergame sold more than a million copies in the first month. That’s in a nation with around five million Wiis in use, so that’s nothing to sneeze at. Play.com is expecting to get more in stock before launch. It seems that people really do want to get healthy. Well, as long as there’s a Wii involved at any rate.