Effects of a Digital Exercise Intervention on Sleep and Physical Activity in Patients With Spondyloarthritis

Inclusion Criteria: * Adults aged 18 to 80 * Followed in rheumatology for axial spondyloarthritis validating the ASAS or modified New York criteria at all stages of progression, * Physically inactive (less than 150 minutes of moderate-intensity leisure-time physical activity per week), assessed at inclusion using the Global Physical Activity Questionnaire (GPAQ). * With stable treatment for 3 months * Signed informed consent * Membership of a social security scheme * Have access to a digital tool with an internet connection (tablet or smartphone) Exclusion Criteria: * Concurrent impairment by another osteoarticular pathology interfering with mobility of the spine or lower limbs, * Central or peripheral neurological damage, * Hip, knee or ankle arthroplasty performed or scheduled within 18 months, * Any contraindication to physical activity (unstable or poorly controlled coronary ischaemia, severe asthma or significant obstructive ventilatory disorder (FEV1/FVC \< 70%, FEV1 \< 60% predicted), musculoskeletal pathology interfering with physical activity, proliferative retinopathy, macroscopic proteinuria, poorly controlled hypertension, etc.). * Patients who do more than 150 minutes of moderate-intensity vigorous physical activity per week as part of their leisure activities. * Persons covered by articles L1121-5 to L1121-8 of the Public Health Code * Staff with a hierarchical link to the principal investigator Non-inclusion criteria related to physical activity : * Body m…