The study aims to constitute a longitudinal Syde® digital health technology (DHT) dataset to serve as a healthy adult reference for Syde® digital variables development and validation. Subjects will be assessed every 6 months for 2 years.

Inclusion Criteria:

• Male or female aged between 18 and 65 years old

• Signed informed consent

• Subjects with a reported BMI ≥ 17 and ≤ 35

• Subject with unlimited internet connection at home and authorizing automatic data upload

• Subject willing and able to comply with all study procedures including:

  • baseline data and questionnaires data entry on EDC (electronic data capture) throughout the study
  • Syde® related procedures

• Subject confirming to be affiliated to, or beneficiary from, a social security category

Exclusion Criteria:

• Elite athletes (at a national level)
• Pregnant women
• Presence of an orthopedic, neuromuscular, or neurological pathology affecting walking gait quality or requiring a walking aid
• Subjects reporting to have an incapacity or invalidity or to be affected by a chronic disease which can affect their activity and/or their lower limb function
• Subjects reporting to have undergone recent surgical procedures, trauma (within 6 months), or affected by a disease or condition affecting lower limb function within 3 weeks before their inclusion

Subjects will be initially provided with information on the study through Ethics Committee validated advertising supports (paper and electronic posters and flyers). These supports will be displayed and distributed by the investigational sites.