Assessment of perceived exertion and dyspnoea after exercise using the modified Borg scale. This scale ranges from 1 to 10. A score close to 1 shows a perception of effort and a feeling of weak dyspnea. Conversely, the higher the score, the more difficult the effort is perceived.

The chair stand-up test will be implemented with a chair placed against a wall. The subject must stand up and sit down as many times as possible from their chair in 30 seconds, without leaning against the backrest and using their hands. This version will be applied since its reliability and reproducibility is greater in subjects whose average age is less than 65 years (Orange et al., 2018).

There will be 18 sessions to do in total and the percentage of participation will be estimated from this number of sessions.

Intensity of sessions measured with Garmin wristband to obtain reserve heart rate during sessions. Reserve heart rate will be measured with the formula : Max Heart Rate - Rest Heat Rate. Participants need to train at 60% of RHR.

The Technology Acceptance Model (TAM) questionnaire was developed in its first version by Davis (1989). The version used is a French translation by Hayotte et al., (2020). It consists of 16 items and follows a Likert scale ranging from 1 to 7 (respectively from "strongly disagree" to "strongly agree"). It measures the perception of a digital tool by subjects. This questionnaire will be used twice, first to measure the acceptability of the digital tool used during the first meeting with patients, then secondly for the acceptance of the digital tool at the end of the various remote sessions.

measured with the IPAQ questionnaire. This questionnaire by Craig et al (2003) consists of 27 questions divided into 5 parts. In each part, the participant is asked to quantify the amount of time in minutes/hours/days spent in PA. The first part comprises questions 1 to 7 and covers all physical activity practised in a professional context. The second part, questions 8 to 13, covers physical activity related to daily commuting (walking, cycling, driving, etc.) (to work, to the stores, etc.). The third part comprises questions 14 to 19 and covers activities related to housework, home maintenance, time spent with family, etc. The fourth part, questions 20 to 25, deals with physical activity related to leisure, sport and free time. Finally, the fifth section includes questions 26 to 27 and covers time spent sitting or lying down during the day.

The "self-esteem" test is a self-questionnaire created by Rosenberg (1968) whose French version is that of Vallières and Vallerand (1990). The test consists of 10 "Likert" type items with reverse item coding. This scale is based on 4 choices organized from 1 to 4 ranging respectively from "completely disagree" to "completely agree".

Body perception questionnaire with figure rating scale. The "Figure Rating Scale" test was developed by Stukard et al. (1983). This test measures the difference between the perceived and ideal body shape of obese people. This test consists of 9 figures numbered from 1 to 9. First, the participant must circle the figure representing the "perceived" physique (their situation at a given time) and then circle the figure representing the "ideal" physique to be achieved. An indicator is then calculated by taking the difference between the ideal score and the perceived score.

Measuring quality of life with the SF-36 questionnaire. The SF-36 is a quality of life questionnaire validated in France by Leplege et al. (1998). This test consists of 36 questions and is based on two dimensions of quality of life: physical and mental health. The questions cover physical mobility, limitations in the practice of daily activities, bodily pain, general health, vitality, bio-psycho-social approach and mental health. Standardized scores range from 0 (poor health) to 100 (good health).

Questionnaire to measure implicit beliefs related to the ability to regulate one's weight. This scale, proposed by Brunette (2010) is an adaptation of an instrument initially created by Dweck & Leggett (1998). Since no version translated into French existed in the literature, we will instead carry out a double translation of the original instrument using two bilingual people. Three researchers who had previously worked in the field of obesity agreed on the final version in French. This questionnaire consists of 6 items following a Likert scale ranging from 1 "Always" to 6 "Never" and measuring the subjects' relative beliefs regarding their ability to regulate their body mass.

Sense of self-efficacy related to physical activity measured by a 2-subscale questionnaire. This questionnaire is the French version of the "Exercice Confidence Survey" (Sallis, 1996) validated by Eeckhout et al. (2012). It consists of 12 items following a Likert scale ranging from 1 "I know I can't" to 5 "I know I can". It is divided into two sub-dimensions, namely: measurement of adherence to PA comprising 8 items (1, 2, 3, 4, 5, 6, 7, 8) and measurement of constraints to PA practice with 4 items (9, 10, 11, 12).

Measuring the nature of motivation for physical activity with the EMAPS questionnaire. This French questionnaire consists of 18 items on a Likert scale ranging from 1 "Does not correspond at all" to 7 "Corresponds very strongly". It aims to measure the different types of motivation for PA in subjects suffering from chronic pathologies according to the continuum proposed by Deci and Ryan (2002). This scale is divided into 6 sub-dimensions, each measuring a specific component of motivation, each comprising 3 items: intrinsic (1, 6, 11), integrated extrinsic (7, 10, 13), identified extrinsic (4, 12, 16), introjected extrinsic (3, 14, 18), external regulation extrinsic (9, 15, 17) and amotivation (2, 5, 8).

Size measured in Centimeters

fat mass (%) measured in the morning on an empty stomach (whenever possible) using a Tanita impedance meter (MC-780MA P, Tanita Europe B.V., Amsterdam, The Netherlands).

fat free mass (Kg) measured in the morning on an empty stomach (whenever possible) using a Tanita impedance meter (MC-780MA P, Tanita Europe B.V., Amsterdam, The Netherlands).

waist circumference (cm) measured by a Doctor according to a standardized protocol.

Participants will be asked to report their feelings of exertion and sensation of dyspnea during the sessions. Assessment of perceived exertion and dyspnoea after exercise using the modified Borg scale. This scale ranges from 1 to 10. A score close to 1 shows a perception of effort and a feeling of weak dyspnea. Conversely, the higher the score, the more difficult the effort is perceived.

The body dissatisfaction test comes from the Eating Disorders Inventory-II developed by Garner et al. (1983), the French version of which is the work of Criquillon-doublet et al. (1995). This test measures personal dissatisfaction with the subjects' body segments or parts. This test consists of 9 items on a 6-level Likert scale ranging from: 1 "never" to 6 "always".