 He started playing football for Enskede IK at the age of six years, Runström's time in Enskede went well and at the age of 12 years he was rewarded with a move to a bigger club; Hammarby IF.Runström developed at a fast speed and when he was 16 he left Hammarby for Italy and Bologna.He stayed in Italy for three years and led Bologna to their first Italian Youth Championship in 19 years in 2001.