|Competitor for Sweden|
|Gold||1908 London||Freestyle javelin|
|Gold||1908 London||Javelin throw|
|Gold||1912 Stockholm||Javelin throw|
|1906 Intercalated Games|
|Gold||1906 Athens||Javelin throw|
|Bronze||1906 Athens||Shot put|
|Bronze||1906 Athens||Tug of war|
Lemming won a total of 7 Olympic medals over three Olympics including 4 golds. His Olympic experience began at the 1900 Summer Olympics in Paris, France. He tried for fourth place in both the high jump and pole vault, clearing 1.70 meters and 3.10 meters in the two events, respectively. Lemming took another fourth place finish in the hammer throw. He took eighth place in the discus throw.
Lemming also competed in the long jump. He finished last of the twelve-man field with a distance of 5.500 metres. Lemming also competed in the triple jump and while his place and distance are unknown, he did not finish in the top six.
In the 1906 Summer Olympics in Athens, Greece. He picked up four medals here, a bronze in the tug of war with the Swedish national team, a second bronze in the shot put, a third bronze in the pentathlon and a gold medal in the javelin (free style) event.
He returned two years later to the 1908 Summer Olympics held in London, Great Britain. Here he won a further two gold medals, defending his title in the javelin (free style) event, the last time this was to be held and also gaining the javelin title.
At the next Olympics in 1912 Lemming retained his javelin title with a throw 6 meters further than he had thrown at the previous games.
- De Wael, Herman. Herman's Full Olympians: "Athletics 1900". Accessed 18 March 2006. Available electronically at .
- Mallon, Bill (1998). The 1900 Olympic Games, Results for All Competitors in All Events, with Commentary. Jefferson, North Carolina: McFarland & Company, Inc., Publishers. ISBN 0-7864-0378-0.