Inclusion Criteria:  CP, spastic diplegia 4-8 years of age The ability to walk with or without assistive devices typically on Level II-III 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 Good trunk control with good antigravity strength of lower extremity on clinical examination.  Exclusionary criteria  Ankle clonus; exaggerated deep tendon reflex in the legs Babinski sign Structural non-reducible deformities or musculoskeletal surgery in the lower extremities in the past 12 months Moderate to severe signs of dystonia, athetosis or ataxia.