Persy is one of Sweden's most successful race walkers, renowned for his consistency at the highest level of international athletics. A three-time Olympian, Persy made history in 2019 by becoming the first Swedish race walker to win a World Championships medal, before securing two bronze medals at the 2022 World Championships.

Since making his Olympic debut in Rio in 2016, Persy has continued to build an impressive international career, winning World Championships silver in 2023 and becoming European 20km Race Walking Champion in Rome in 2024. He also claimed team gold at the World Athletics Race Walking Team Championships in 2022 and 2024.

In 2026, Persy successfully transitioned to the marathon race walk, winning on his debut in Santee, California, before claiming victory at the Rio Maior Race Walking Gold meeting. With multiple Swedish records and a career defined by resilience and historic achievements, he remains a leading figure in international race walking.