I’ve been doing my hour lap of the Uetliberg for a few weeks now, but it’s been getting progressively harder because of the snow and compacted ice on the mountain, which means I’ve been walking / skating / slipping and nearly falling, rather than running! So today I went into our local “Bergsport” (mountain sport!) shop and bought these great heel spikes. They fasten over your trainers and your heel then has fantastic gripping power! I was able to do my circuit in 58 minutes and managed to keep up my 3 minutes running / 1 minute walking for most of the circuit (apart from the 16 minute steep uphill climb at the start) and it felt great! I didn’t slip once as long as I remembered to dig my heels into the ice first!