That's a play on the word 'memory', but I realise now that it wasn't very obvious. Anyway, I did an hour cards practice this afternoon, for the first time in a very long while. I've been doing speed training for the last few days, but if I'm to have any chance in the world championship I need to be regularly doing marathon practice from now until October (or whenever it is. I should check.)
Cards has always been the marathon discipline I've found easiest to get into without my mind wandering, probably because of the constant moving of my hands as I juggle the cards between them. If I can follow this up with an hour numbers practice, and then get into the habit of doing them both (and half-hour binary too), then I'll be all set.
I still need a new system for numbers, but that might have to wait until next year.