The PROMESS - PHYSICAL ACTIVITY project aims to offer solutions to students to decrease their sedentary behavior and to improve their physical activity level during their medical studies through an intervention program. From a long term perspective, this intervention may also prevent disorders related to inadequate levels of physical activity and/or sedentary behavior. It responds to a demand expressed by students : our previous field study showed that 45% of fourth-year students declared being "very interested and/or interested" in following an intervention that aimed at improving physical activity. The objective of this study is to determine the influence of an intervention based on sedentary behavior reduction and physical activity promotion among medical students. conditions: Health Behavior conditions: Health-Related Behavior conditions: Physical Inactivity conditions: Sedentary Behavior conditions: Sedentary Time studyType: INTERVENTIONAL phases: NA allocation: NA interventionModel: SINGLE_GROUP interventionModelDescription: All volunteers will receive a physical activity and sedentary management intervention. primaryPurpose: HEALTH_SERVICES_RESEARCH masking: NONE count: 45 type: ESTIMATED name: Sedentary and physical activity behaviors measure: Perceived level of sedentary : Evolution of the score obtained at the Rapid Physical Activity Questionnaire (RPAQ) on sedentary behaviors. measure: Perceived level of physical activity : Score obtained at the Global Physical Activity Questionnaire (GPAQ) on physical activity levels. measure: Perceived level of sedentary : Score obtained at the Rapid Physical Activity Questionnaire (RPAQ) on sedentary behaviors. measure: Actimetry records.Total activity during the pre-intervention. measure: Actimetry records. Moderate-to-vigorous Physical Activity (MVPA) during the pre-intervention. measure: Actimetry records. Light Physical Activity during the pre-intervention. measure: Actimetry records. Steps count during the pre-intervention. measure: Actimetry records. Energy expenditure during the pre-intervention. measure: Actimetry records. Number of sedentary breaks during the pre-intervention. measure: Actimetry records. Sedentary time during the pre-intervention. measure: Actimetry records. Number of prolonged sedentary bouts during the pre-intervention. measure: Actimetry records.Vector of the dynamic body acceleration (VeDBA) during the pre-intervention. measure: Body composition markers. Body Mass Index (BMI) during the pre-intervention. measure: Body composition markers. Skeletal muscle mass measured by bioimpedancemetry during the pre-intervention. measure: Body composition markers. Fat mass measured by bioimpedancemetry during the pre-intervention. measure: Body composition markers. Total body hydration measured by bioimpedancemetry during the pre-intervention. measure: Physical Fitness markers - Strength. The force developed during a maximal isometric contraction of the quadriceps during the pre-intervention. measure: Physical Fitness markers markers - Power. Height of jump during the pre-intervention. measure: Physical Fitness markers - Power. Time of flight during the pre-intervention. measure: Physical Fitness markers - Power. Relative Power during the pre-intervention. measure: Physical Fitness markers - Endurance. Speed through the endurance test during the pre-intervention. measure: Physical Fitness markers - Endurance. VO2max through the endurance test during the pre-intervention. measure: Physical Fitness markers - Endurance. Heart rate during the endurance test during the pre-intervention. measure: Perceived level of physical activity : Evolution of the score obtained at the Global Physical Activity Questionnaire (GPAQ) on physical activity level. measure: Actimetry records. Evolution in Total activity during the intervention. measure: Actimetry records. Evolution in Moderate-to-vigorous physical activity (MVPA) during the intervention. measure: Actimetry records. Evolution in Light physical activity measured in min/day during the intervention. measure: Actimetry records. Evolution in Step Count during the intervention. measure: Actimetry records. Evolution in Energy expenditure during the intervention. measure: Actimetry records. Evolution in number of sedentary breaks during the intervention. measure: Actimetry records. Evolution in Number of prolonged sedentary bouts during the intervention. measure: Actimetry records. Evolution in the vector of the dynamic body acceleration (VeDBA) during the intervention. measure: Body composition markers. Evolution in BMI during the intervention. measure: Body composition markers. Evolution in fat mass measured by bioimpedancemetry during the intervention. measure: Body composition markers: Impedance metric measures. Evolution in skeletal muscle mass measured by bioimpedancemetry during the intervention. measure: Body composition markers: Impedance metric measures. Evolution in total body hydration measured by bioimpedancemetry during the intervention. measure: VAS - physical fitness: Evolution of the score obtained at the 100-mm Visual Analogue Scale (VAS) assessing the perceived level of physical fitness. measure: VAS - physical activity. Evolution of the score obtained at the 100-mm Visual Analogue Scale (VAS) assessing the perceived level of physical activity. measure: VAS - sedentary behaviours. Evolution of the scores obtained at the 100-mm Visual Analogue Scale (VAS) assessing the perceived level of sedentary behaviours. measure: Advices given by the expert. Score obtained on a Likert scale ranging from 1 to 5 characterizing the nature of the advices given by the expert. measure: Likert - expert estimation of student's achievements. Score obtained on a Likert scale ranging from 1 to 3 accessing if the expert estimates that the student has achieve the goals previously set. measure: Likert - expert satisfaction. Scores obtained on a Likert scale ranging from 1 to 5 accessing the expert's satisfaction of his/her intervention. measure: Likert - expert level of comfort. Score assessing the expert comfort levels in participant relationships on a likert scale ranging from 1 to 5. measure: Likert - expert estimation of the overall student's achievements. Score obtained on a Likert scale ranging from 1 to 5 accessing the expert's level of satisfaction on the student's progress. measure: Composite score - Student's satisfaction. Score ranging from 0 to 100 accessing the student's level of satisfaction of the all intervention. sex: ALL minimumAge: 18 Years maximumAge: 80 Years stdAges: ADULT stdAges: OLDER_ADULT facility: RESHAPE status: RECRUITING city: Lyon zip: 69008 country: France name: Sophie Schlatter, Dr. role: CONTACT phone: 07 68 21 05 51 phoneExt: 33 email: sophie.schlatter@univ-lyon1.fr name: Angèle Métais, Dr. role: CONTACT phone: 06 77 39 89 66 phoneExt: 33 email: angele.metais@univ-lyon1.fr lat: 45.74848 lon: 4.84669 hasResults: False