Stephan Lehmann, a former football star and goalkeeper coach, Hergiswil, Switzerland

I wear them every day: after all, I'm not 20 anymore. And as you get a bit older you naturally realise that your health comes first. I have long-term carry-over problems with my back and my knees – partly a legacy of my career, which was relatively long, so they certainly support me with that and help me continue to age well. I've now really found that they take the stress off me as after all, you do always have to use and activate even your smallest muscles, so they activate muscle fibres that might have slacked off a bit. And that's probably the key to success. I don't want to get all medical: I don't know enough about that, but I'm simply happy to have these shoes on my feet.