Inclusion Criteria:  Patients with a medical diagnosis of hemophilia A or B. Patients with a severe phenotype of hemophilia (<1% FVIII/FIX). Patients with a medical diagnosis of hemophilic knee arthropathy and more than 3 points on the Hemophilia Joint Health Score. Being over 18 years old. No scheduled orthopedic surgeries during the study phase  Exclusion Criteria:  Patients with hemarthrosis in the month before the beginning of the study. Patients unable to walk. Severe functional alterations of the upper limb that prevented the exercises. Failure to sign the informed consent document