sentences:  Niels Petersen (gymnast)
  
  Niels Knudsen Petersen (July 12, 1885 – April 29, 1961) was a Danish gymnast who competed in the 1906 Intercalated Games, the 1908 Summer Olympics, and the 1912 Summer Olympics.At the 1906 Intercalated Games in Athens, he was a member of the Danish gymnastics team, which won the silver medal.