 More aerodynamic skating suits were also developed, with Swiss skater Franz Krienbühl (who finished 8th on the Olympic 10,000 m at the age of 46) at the front of development.After a while, national teams took over development of "body suits".Suits and indoor skating, as well as the clap skate, has helped to lower long track world records considerably; from 1971 to 2007, the average speed on the men's 1500 metres was raised from .