Inclusion Criteria:  Female Patient > 18 years Follow-up in the department of clinical Nutrition of Rouen BMI ≥15,0 and <18,5 kg/m² Diagnosis of anorexia nervosa according to DSM-V classification  Exclusion Criteria:  Physical activity contraindications : hemodynamic disorder, uncontrolled cardiovascular disease, intracranial hypertension Patients with poor understanding of spoken or written French Person deprived of their liberty by an administrative or judicial decision or person subject to a legal measure for the protection of adults Person subject to a safeguard of justice, guardianship or curatorship. Pregnant or breastfeeding woman