(By the way, I couldn't google the exact phrase, but found a few links about how to install Discworld II on WinXP. Well, well, well...)
Anyway, Skazz was perfectly right.
So I bought a fitball. It's like,
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjnb_n2_SbVzeMTsrhAiNk3wtvZu0vHRnok150HEBxoYWsgJgHubacd_Pl1tw-X6VV-TSP0fL8ruVJ8wOed4DqJnt8kxh37vjIf9ujLcxoIEdlkDrt9qMMXIyyhHI82hpEdHZdDZG6L23_A/s1600/fitball.png)
No, I haven't punctured it yet :)
And no, it's not that hard to keep balance (it's quite easy to sit, at least :)
Yes, it's big and plum-coloured,
and yes, it's great to sprawl out on it :)