Kammala jumla mai zuwa: Kafin aikinsa na siyasa Leskinen ya kasance mai cin nasara a cikin kungiyar Helsinki Workers 'Swimmers. Ya lashe gasar tseren mita 200 da 400 a gasar Olympics ta 1937 a Antwerp. Leskinen daga baya ya zama Babban Sakatare na Ƙungiyar Wasannin Wasanni na Finland 1940-1943 kuma shugaban 1951-1955. Leskinen ya yi yaƙi a cikin
Yakin hunturu da ci gaba. An ji masa rauni a 1941. Matsayinsa na soja shi ne Manjo.