Watch Online Free on Watchseries. Ruth Hanson was of Danish descent, trained in dance and gymnastics in Denmark but then returned home. In 1927, Ruth hired Loft Guðmundsson, a photographer and filmmaker, to film a short instructional film on Flat-Charleston dancing. Ruth Hanson was 21 at the time, and her dance partner in the film was her 14-year-old sister, Rigmor.