Fienhage was part of the German team, along with
Martin Smolinski and
Max Dilger, that won the silver medal at the
2019 Team Long Track World Championship. The following season, he won the gold medal at the
World Longtrack Championship in the
2020 Individual Long Track World Championship. In 2022, he was part of the German team, along with
Erik Riss and
Max Dilger, that won the
2022 Team Long Track World Championship and two years later in 2024, won another gold medal at the
2024 FIM Long Track of Nations. At the
2024 FIM Long Track World Championship Fienhage secured the silver medal, in addition to winning two of the five rounds and in 2025 won the bronze. == References ==