Inclusion Criteria:  CP, spastic diplegia and quadripledia 4-8 years of age On Level IV-V on Gross Motor Function Classification System At least six months after the last Botulinum toxin A injection in the lower extremities Average intelligent quotient according to medical records for active participation Partial trunk control (sitting with support).  Exclusion Criteria:  Structural non-reducible deformities or musculoskeletal surgery in the lower extremities in the past 12 months Ankle clonus Exaggerated deep tendon reflex in the legs Babinski sign; Moderate to severe signs of dystonia, athetosis or ataxia.