Magnus began racing at a national level when he was 10. He got into the racing scene because of his local team Boulder Junior Cycling, which really got him to fall I love with racing. The 2021-22 season was his first time racing at a UCI level as a first year 17-18, where he accomplished some of his biggest goals. He won the 2021 USA Cycling National Championship then went straight over to race in Europe during the Christmas Block. His success in Europe earned him a spot on the 2022 World Championships team in Fayetteville.