This research project aims to evaluate the benefits of a functional exercise program with strength and resistance load in adolescents with cerebral palsy (CP), specifically classifiedat levels III and IV of the Gross Motor Function Classification System (GMFCS) scale. Participants will be included into control or intervention group in this randomized controlled trial. Changes in functional percentile, quality of life, and participation in daily environments will be analyzed based on scores obtained with validated assesment scales. The study will be conducted at the Children's Neurorehabilitation Unit of Hospitalarias Foundation in Valencia, with an 18-week intervention plus a 6-month follow-up. This project seeks to provide evidence on rehabilitation strategies that promote autonomy and social inclusion for this population.