Well, my old ones, anyway! They've taken me through the C25K programme twice, and beyond. You can tell how old they are because they're white – can't get monochrome trainers any more. I got the new ones for when I accompany a friend to the gym as I didn't think my old mud-spattered ones would be very welcome indoors. However, I noticed today that the tread on the old ones was really going. So it's a fond farewell with thanks, dear old trainers, and on with the new!