At the moment of recruitment (before treatment), at the end of treatment (6 weeks) and one month and two months after the end of the treatment (FU) each patient will be tested with the following clinical and instrumental procedures. Clinical assessment procedures: 6-minute Walking Test, Ten Meter Walking Test, Gross Motor Classification System, Child Health Questionnaire (CHQ-PF50) Italian version, Wee FIM and Energy Expenditure Index. Instrumental assessment procedures: Gait analysis by means of GAITRite® System and measure of energy cost by COSMED K4b2.