[2] He started his career in Vienna at a local gymnastics club.

Due to his work as mechanical engineer he came to Germany and Switzerland, where he continued to compete in local clubs at the beginning of the 20th century.

In 1903 he travelled to the United States and found work and a new gymnastics club in Philadelphia.

As a member of Philadelphia Turngemeinde, Lenhart competed at the Olympic Games in St. Louis in 1904.

[1] Because athletes did not compete for their nations at early Olympic Games as they do now, some references credit Lenhart's medals to the United States, as he was representing his Philadelphia-based club,[1] but the IOC database regards him as Austrian.