Answer by taking a quote from the following article:

Louis "Louison" Bobet (pronounced [lwi.zo bo.be]; 12 March 1925 - 13 March 1983) was a French professional road racing cyclist. He was the first great French rider of the post-war period and the first rider to win the Tour de France in three successive years, from 1953 to 1955. His career included the national road championship (1950 and 1951), Milan-San Remo (1951), Giro di Lombardia (1951), Criterium International (1951 & 52), Paris-Nice (1952), Grand Prix des Nations (1952), world road championship (1954), Tour of Flanders (1955), Criterium du Dauphine Libere (1955), Tour de Luxembourg (1955), Paris-Roubaix (1956) and Bordeaux-Paris (1959).

Louis Bobet was born one of three children above his father's baker's shop in the rue de Montfort, Saint-Meen-le-Grand, near Rennes. His father gave him a bicycle when he was two and after six months he could ride it 6 km. Bobet's father was also called Louis and the son was called Louison - little Louis - to avoid confusion The ending -on is a diminutive in French but outside Brittany Louison refers more usually to a girl. He was known as Louis in his early years as a rider, even as a professional, until the diminutive Louison gained in popularity.  His sister played table tennis, his brother Jean football, although he also became a professional cyclist. Louison played both table tennis and football and became Brittany champion at table tennis. It was his uncle, Raymond, who was president of a cycling club in Paris who persuaded him to concentrate on cycling.  Bobet's first race was a 30 km event when he was 13. He came second in a sprint finish. He raced in his local area and won four events for unlicensed riders in 1941. He qualified for the final of the unofficial youth championship, the Premier Pas Dunlop in 1943 at Montlucon and came sixth. The winner was Raphael Geminiani, who would become a professional team-mate and rival.  Bobet is said to have carried messages for the Resistance during the second world war. After D-Day he joined the army and served in eastern France. He was demobilised in December 1945.

Did he perform other sport eventually?
It was his uncle, Raymond, who was president of a cycling club in Paris who persuaded him to concentrate on cycling.