The aim of the present study was to assess whether supervised slackline training improves postural control in children and teenagers with spastic cerebral palsy (grade I and II of the Gross Motor Function Classification System).

Inclusion Criteria:

• Diagnosis with any expression of spastic cerebral palsy and rated I-II on the Gross Motor Functional classification.
• Between 9 and 16 years of age.
• Ability to cooperate with simple instructions.
• Able to stand for at least 2 min without assistance.
• Able to walk at least 10 m without assistance.

Exclusion Criteria:

• Individuals were excluded if they underwent neuro or orto surgery during or up to one year prior to the study, botulinum toxin injection or intrathecal pump during or up to six months prior to the study and/or rotational osteotomies, if they expressed gait deviations limited by musculoskeletal contracture, presented specific medical or orthopedic conditions that precluded exercising
• or if they did not meet the eligibility criteria.