Things to do whilst you're still able

[lethargic_man]

Walk the streets and you'll see little old men and women walking along extremely slowly, for whom even the walk to the shops is evidently a considerable effort. There's a not unreasonable chance I'll end up that way myself, provided I live that long, so I should really take advantage now of the fact I've got a fully working body. What would you recommend I do with it?