Prehabilitation in Childhood Soft Tissue or Bone Sarcomas

This study aims to investigate the feasibility of a prehabilitative training intervention. The intervention includes specific strength and balance exercises during neoadjuvant chemotherapy with children and adolescents diagnosed with soft tissue or bone tumor in the lower extremity. This explorative approach of prehabilitation might help to reduce muscle and bone weakening and associated functional limitations during and after acute therapy. By designing this study like a controlled clinical trials, the investigators will also gather preliminary data on the intervention's potential effects in enhancing/on the pre-operative condition. The goal is to improve post-operative outcome and rehabilitation processes in children and adolescents diagnosed with soft tissue or bone sarcoma of the lower extremity.