Pain will be measured using the Brief Pain Inventory (questionnaire), a self-administered questionnaire used to evaluate the severity of a patient's pain and the impact of this pain on the patient's daily functioning. The patient is asked to rate their worst, least, average, and current pain intensity, list current treatments and their perceived effectiveness, and rate the degree that pain interferes with general activity, mood, walking ability, normal work, relations with other persons, sleep, and enjoyment of life on a 10 point scale.

The Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F) is a 40-item measure that assesses self-reported fatigue and its impact upon daily activities and function (questionnaire). FACIT-F scores range between 0 and 52, with higher scores indicating less fatigue.

A Jamar handheld dynamometer will be used to measure upper limb strength.

The presence of lymphedema will be evaluated with tape measurement of the neck circumference

%water content will be measured with the MoisturemeterD Compact (tissue dielectric constant (TDC) measurement)

Self-reported lymphedema will be assessed with the Lymphedema Symptom Intensity and Distress Survey - Truncal and Head and Neck (LSIDS-H&N).This tool was developed specifically to measure lymphedema symptoms in HNC patients. The tool asks participants to indicate the presence of a symptom (yes or no). Participants then rate all yes symptoms for intensity and distress on two separate 10-point numeric scales.

The range of motion of both shoulder forward flexion and abduction will be measured using an inclinometer

The 6 minute walking distance (6MWD) will be used to evaluate physical fitness. This is a sub-maximal exercise test used to assess aerobic capacity and endurance. The distance covered over a time of 6 minutes is used as the outcome.

Body composition will be assessed through Bio-impedance Spectroscopy with InBody device. Bioelectrical Impedance Analysis (BIA) is a method of quantifying body composition by introducing an electrical current throughout the body. InBody uses this method to measure body composition, which divides the persons weight into different components, such as water, lean body mass and fat mass.

The PROMIS physical function short form (PROMIS-PF-SF) (questionnaire) will be used to measure physical functioning. It is composed of 10, 5-point Likert-scale items. A higher PROMIS T-score represents more of the concept being measured.

Medical Research Council Rating Scale for Fibrosis: 4-point rating scale ranging from none to very marked density, retraction, and fixation.

RTOG Late Radiation Morbidity Scoring Scheme : 0-4 scale with descriptors for each category. Health provider administered, based on patient symptoms: 0 - absence of radiation effects, 5 - effects led to death. Severity of reaction is graded from 1-4.

The Depression, Anxiety and Stress Scale-21 (DASS-21)(questionnaire) will be used. The Depression, Anxiety and Stress Scale - 21 Items (DASS-21) is a set of three self-report scales designed to measure the emotional states of depression, anxiety and stress.

The rating scale is as follows: 0 Did not apply to me at all- 1 Applied to me to some degree, or some of the time - 2 Applied to me to a considerable degree or a good part of time - 3 Applied to me very much or most of the time.

Each of the three DASS-21 scales contains 7 items, divided into subscales with similar content.

General Self-Efficacy Scale (questionnaire). This scale is a self-report measure of self-efficacy with 10 items (scored from 1-4). The total score is calculated by finding the sum of the all items. For the GSE, the total score ranges between 10 and 40, with a higher score indicating more self-efficacy.

The Physician-based Assessment and Counseling for Exercise (PACE) has 8 items intended to identify the patient's stage of readiness to begin a physical activity program.

Behavioral Regulation in Exercise Questionnaire 2 will be used to assess motivation towards exercise. The BREQ-2 is a 19 item questionnaire that measures the stages of the self-determination continuum with respect to motivation to exercise with a 5 point Likert scale (0=not true for me, 4=very true for me)

The short version of the Disability of Arm, Shoulder and Hand - questionnaire will be used to evaluate upper limb function. The QuickDASH is a shortened version of the DASH Outcome Measure. Instead of 30 items, the QuickDASH uses 11 items to measure physical function and symptoms in people with any or multiple musculoskeletal disorders of the upper limb. The resultant score is reported on a scale of 0 to 100, where 0 represents no disability and 100 represents total disability

Both the International Physical Activity Questionnaire and daily step count (accelerometry) will be used to determine the physical activity level.

The IPAQ is a 27-item self-reported measure of physical activity for use with individual adult patients aged 15 to 69 years old.

Impact on Participation and Autonomy Questionnaire : The IPA is a questionnaire that focuses on autonomy and participation of people with chronic conditions. The perceived participation scale consists of 31 items which are assessed using a 5 point rating scale (1=very good and 5=very poor) and the problem scale contains 8 items which are assessed using a 3 point rating scale (0=no problem and 2=severe problem). A participation score (range: 30-155) and a problem score (0-16) are produced by summing items in each scale.

The subjects will be asked to report their return to work

Health-related quality of life will be measured with the European Organisation for Research and Treatment of Cancer quality of life questionnaire (EORTC QLQ-C30). The QLQ-C30 is composed of both multi-item scales and single-item measures. These include five functional scales, three symptom scales, a global health status / QoL scale, and six single items.

Each of the multi-item scales includes a different set of items - no item occurs in more than one scale. All of the scales and single-item measures range in score from 0 to 100. A high scale score represents a higher response level. Thus a high score for a functional scale represents a high / healthy level of functioning, a high score for the global health status / QoL represents a high QoL, but a high score for a symptom scale / item represents a high level of symptomatology / problems.

•Sample characteristics (based on education level, age, self-efficacy, type of cancer, …) to identify subgroups of head and neck patients who participate, adhere best to the program and would benefit the most of it

•Retention of participants by estimating 6-month follow-up rates

•Satisfaction with the intervention: participants will be asked to response on a 5-point scale from 1 (not at all satisfied/no) to 5 (very satisfied/definitely yes)

•Safety of the procedures in the intervention: Physical Activity Readiness- Questionnaire.

The PAR-Q is a simple self-screening tool that is used to determine the safety or possible risks of exercising based on a subjects health history, current symptoms, and risk factors.

All the questions are designed to help uncover any potential health risks associated with exercise.

In a subgroup of participants, a qualitative study on the feasibility of the CSEP in daily clinical practice will be organized. All participants will be invited at baseline, 12 weeks and 6 months to participate in focus groups to discuss acceptability, expectations and satisfaction with the CSEP and maintenance program over time (baseline up to 6 months follow-up). During the focus group, a research assistant will ask a series of Likert-scale rated and open-ended questions related to the acceptability, expectations, and satisfaction of the exercise program. Fifteen patients (based on their willingness to participate in the focus group) will participate in 2-3 focus groups per time point. All raised issues will be considered and the exercise program will be modified accordingly.