Randomized, controlled, open, comparative intervention study in two groups, each consisting of 25 children with type 1 diabetes that will undergo twelve weeks of exercise program (intensive arm) and twelve weeks of regular activity (non intensive arm) separated by four week of washout period. The study will be conducted in a crossover manner: one group starting with the intensive arm followed by the non intensive arm and vice versa. Blood glucose, HbA1C, Fructosamine, 3 days continuous glucose monitoring system (CGMS), total daily insulin dose, fasting lipid profile, body impedance and BMR will be measured. Self esteem and quality of life questionnaires will be filled.