Jessica Brändle, sings alto in the Gossau gospel choir, Switzerland

I'd never worn shoes like this before; I'd never heard of them. The first time I wore kybun shoes, it was extremely tough for me to stand in the shoes while singing. I needed a moment off to stand on the hard ground. The next day my calf muscles ached. But it kept getting better over time. I got used to it more and the shoes got softer. Now it feels really pleasant singing on that surface. You bounce about a bit,  which is very pleasant.