Victor Asenov, a visually impaired ultramarathon runner, walks next to his guide dog Taddy as he attempts to cover the same elevation as Mount Everest, an activity known as ‘Everesting’, by running up and down the Black Peak summit of the Vitosha mountain, to raise awareness of a guide dog school, near Sofia, Bulgaria, March 21, 2025. REUTERS/Spasiyana Sergieva