My week has been pretty hectic so far. On Monday, I manned a busy beach bar and had to remember a range of ice-cream and pizza orders for a constant stream of customers.

On Tuesday, I had to shoot down a selection of rapidly moving birds in a forest dense with autumnal leaves. On Wednesday, I had to think of as many words as I could beginning with "TO." And that was before I'd even started on memorizing a repetitive polygon shape as it flashed up at ever-increasing speed.

This is the wonderful world of "brain training." For the past month, I have been completing a series of computer games designed to test my memory, verbal reasoning, concentration and spatial awareness. The beach bar was made out of pixels. The birds were shot down with the click of a mouse. It turns out there are loads of words beginning with TO, many of which I hadn't guessed in the requisite 60 seconds.