Horst Lesser, who started for the Motor Brotterode association, made his international debut at the Four Hills Tournament in 1955/56 after winning the title at the GDR youth championships in 1954 in Nordic combined and ski jumping. During the tour he started his first competition in Garmisch-Partenkirchen and reached rank 24, before jumping into the top 10 for the first time with eighth place on the zinc hill in Hallein and thus also achieving the best tour result. In the overall standings, Lesser took 22nd place. In the following year he started again in the Four Hills Tournament 1956/57 and after three competitions with good top 20 placements reached 23rd place in the overall ranking.
Lesser was active well into old age and started running events in the senior classes for TSV Zella-Mehlis . In 2003 he took part in the Gothaer City Run as a runner and reached fifth place in his M65 age group. In 2014, at the age of 80, he was once again a guest at the club's sports festival.