Career
He was also an able long distance runner. He represented the club Lensvik Illinois.
cross-country skier athletics competitor
He was also an able long distance runner. He represented the club Lensvik Illinois.
He also won nine Norwegian championship titles and received the King"s cup in 1963 and 1967. Grønningen won the 15 km twice (1960 and 1961) at the Holmenkollen ski festival and earned the Holmenkollen medal in 1961. His personal best times were 15:03.2 minutes in the 5000 metres, achieved in September 1963 at Trondheim stadion, and 31:04.6 minutes in the 10,000 metres, achieved in September 1961 at the same stadium.
