Neuromuscular Mechanisms of Specific Trunk Interventions in Children With CP

Inclusion Criteria: * Children with a diagnosis of bilateral spastic CP attributed to complications of prematurity, intracranial hemorrhage and periventricular leukmalacia according to the definition of Bax. * Children aged 4 to 12 years old without Botulinum toxin treatment within 6 months, and without surgeries (such as selective dorsal rhizotomy) within 12 months before the onset of the training. * Subjects will be able to remain seated without help for ≥10s. * GMFCS levels will be I to IV. * Children must be able to signal pain, fear or discomfort reliably. * Children with mild scoliosis (Cobb angle \< 20 °). * Children with CP who have no prior hippotherapy experiences within 6 months. Exclusion Criteria: * severe lower extremity contractures, fractures, osseous instabilities, osteoporosis. * severe disproportional bone growth. * unhealed skin lesions in the lower extremities. * thromboembolic diseases, cardiovascular instability. * aggressive or self-harming behaviors.