Dresdner SC
Harbig, as a professional soldier, continued to participate in track events. On 24 June 1934, he competed in an 800 metres event at the Dresdner SC stadium, won, and was asked to join the preparations for the 1936 Summer Olympics in Berlin. He began a comprehensive interval training supervised by the Dresdner SC officials and athletics coach Josef Waitzer. In summer 1935 he left the military to concentrate on his sporting career, while he still had to take on part-time jobs to earn money.