Established 1980, operating from 12 stores, over 120 employees, annual turnover over £24 million Powerhouse Fitness is part of the Sport-Tiedje Group, Europe's No. 1 for home fitness. Powerhouse Fitness was established 1980, and operates from 10 locations in the UK with a head office based in Glasgow . Sport-Tiedje trades in 11 languages, and has 74 stores in Germany, Austria, Switzerland, Belgium, the Netherlands and Denmark. The Sport-Tiedje Group currently employs about 500 people and keeps growing.