Inclusion Criteria:  Person who has given oral consent Subject capable of understanding simple commands and giving consent Subject (male or female) between 18 and 40 years of age. Subject able to do moderate physical activity  Exclusion Criteria:  Person not affiliated to national health insurance. Physical disabilities affecting the lower limbs or the pelvis, and which may hinder or prevent the practice of exercise on an ergocycle, whether neurological (central or peripheral), arterial (in particular, arterial disease of the lower limbs with a systolic index < 0.6) or orthopedic (degenerative or inflammatory rheumatism). Person under legal protection (curatorship, guardianship) Person under court order (sauvegarde de justice) Pregnant, parturient or breastfeeding women Major unable to express consent Minor