Measure to assess participation in daily and social activities. Participants will be presented with a list of 26 activities. For each activity, they are asked, "Do you participate in this activity?" Response options are "Yes, as much as I want" (4); "Yes, but less than I want"(3); "No, but I would like to" (2); and "No, but I don't want to" (1). An overall participation in daily and social activities score will be calculated as well as six sub-scale scores reflecting broad categories of participation will be summed. The 6 subscales are autonomous participation- indoors (7 items, range 7-28), autonomous participation-outdoors (6 items, range 6-24), family roles (4 items, range 4-16), health (2 items, range 2-8), social relationships (4 items, range 4-16), work-education (3 items, range 3-12). Each sub-scale is calculated by adding the scores of the individual items. A higher score of each category indicates greater participation.

Standardized and validated quality of life measure that asks 11 questions about satisfaction in various areas of life, including life in general, vocation, financial situation, leisure, social/friends/family, sexual life, family life, and physical and mental health (1=very dissatisfying to 6=very satisfying). The mean score of the 11 items will be calculated for this measure.

Measures symptoms of depression using 9 items. Participants will be asked, "Over the past 4 weeks, how often have you been bothered by any of the following problems?" and rate each symptom (eg, little interest or pleasure in doing things, poor appetite or overeating) on a 4-point scale (0=not at all; 1=Several days; 2=More than half the days 3=nearly every day). A mean score of the items will be computed with higher scores indicating higher reported symptoms of depression.

Measures self-determination theory perspective on need support. Participants will respond to six items (e.g., "My exercise counselor listened to how I would like to do things regarding my exercise") on a 7-point Likert scale ranging from strongly disagree (1) to strongly agree (7). A higher mean score indicates greater perceptions of need support.

This measure consists of a battery of short questionnaires assessing psychosocial predictors of leisure time exercise activity such as self-efficacy, intentions, and action planning among adults with spinal cord injury. Intentions were measured with 2 items and participants responded on a scale (1-strongly disagree 7-strongly agree). Action planning was measured with 4 items and participants responded on a scale (1-definitely false 7-definitely true). Barrier self efficacy was measured with 6 items and task efficacy was measured with 8 items and participants responded on a scale (1-not at all confident 7-completely confident). A higher score on each of the questionnaires indicated higher levels (e.g., greater intentions, self-efficacy, and action planning).

Measure to assess changes in all 6 motivational regulations as per self-determination theory asking reasons why individuals engage in exercise/physical activity during the intervention. Participants will respond to 23 items (e.g, "I don't see why I should have to exercise"), on a 5-point Likert scale ranging from 0 (not true for me) to 4 (very true for me), covering the types of motivational regulations on the self-determination continuum. The mean score of participants' autonomous and controlled motivation will be calculated. A higher mean score indicated a higher level of that type of motivation. Outcome measure data are not presented because of missingness.

Control Group: For participants assigned to the control group, they will be asked to continue with their regular routine for the next two months. Otherwise, the participants in this group will be asked to complete the follow-up baseline questionnaires at 6 and 10 weeks post-baseline. They will be contacted by a physical activity counsellor at the end of the 10-week period.

Total of all reporting groups

One missing data

Missing data

Missing data

Control Group: For participants assigned to the control group, they will be asked to continue with their regular routine for the next two months. Otherwise, the participants in this group will be asked to complete the follow-up baseline questionnaires at 6 and 10 weeks post-baseline. They will be contacted by a physical activity counsellor at the end of the 10-week period.

Measure to assess changes during the intervention in the basic psychological needs for exercise as per self-determination theory. Data will be collected at baseline, week 6, and week 10 for both participant groups. On a 6-point likert scale ranging from 1 (false) to 6 (true), participants will respond to 18 items reflecting how they might feel when physically active. After summating all items, a total mean score was calculated for autonomy (6 items; "I feel free to exercise in my own way"), competence (6 items; "I feel that I am able to complete exercises that are personally challenging"), and relatedness (6 items; "I feel close to my exercise companions who appreciate how difficult exercise can be"). A higher value indicates greater need satisfaction. Total values are reported in the data table as a sum of all 3 categories (Score range is 3-18).

Questionnaire used to measure physical activity levels. Participants will be asked to indicate the frequency (days) and duration (in minutes) they engage in mild, moderate, and vigorous intensity activities over the last 7 days. Weekly minutes of total activity (mild, moderate, and vigorous) and of moderate and vigorous activity will be summed.

Measure to assess participation in daily and social activities. Participants will be presented with a list of 26 activities. For each activity, they are asked, "Do you participate in this activity?" Response options are "Yes, as much as I want" (4); "Yes, but less than I want"(3); "No, but I would like to" (2); and "No, but I don't want to" (1). An overall participation in daily and social activities score will be calculated as well as six sub-scale scores reflecting broad categories of participation will be summed. The 6 subscales are autonomous participation- indoors (7 items, range 7-28), autonomous participation-outdoors (6 items, range 6-24), family roles (4 items, range 4-16), health (2 items, range 2-8), social relationships (4 items, range 4-16), work-education (3 items, range 3-12). Each sub-scale is calculated by adding the scores of the individual items. A higher score of each category indicates greater participation.

Standardized and validated quality of life measure that asks 11 questions about satisfaction in various areas of life, including life in general, vocation, financial situation, leisure, social/friends/family, sexual life, family life, and physical and mental health (1=very dissatisfying to 6=very satisfying). The mean score of the 11 items will be calculated for this measure.

Measures symptoms of depression using 9 items. Participants will be asked, "Over the past 4 weeks, how often have you been bothered by any of the following problems?" and rate each symptom (eg, little interest or pleasure in doing things, poor appetite or overeating) on a 4-point scale (0=not at all; 1=Several days; 2=More than half the days 3=nearly every day). A mean score of the items will be computed with higher scores indicating higher reported symptoms of depression.

Measures self-determination theory perspective on need support. Participants will respond to six items (e.g., "My exercise counselor listened to how I would like to do things regarding my exercise") on a 7-point Likert scale ranging from strongly disagree (1) to strongly agree (7). A higher mean score indicates greater perceptions of need support.

A measure of affective experience capturing broader aspects of well-being/quality of life

Measures meaningful life experience capturing broader aspects of well-being/quality of life. This 5-item scale asks participants to rate their responses from 1 (absolutely untrue) to 7 (absolutely true). A higher score indicated greater reported meaning.

This measure consists of a battery of short questionnaires assessing psychosocial predictors of leisure time exercise activity such as self-efficacy, intentions, and action planning among adults with spinal cord injury. Intentions were measured with 2 items and participants responded on a scale (1-strongly disagree 7-strongly agree). Action planning was measured with 4 items and participants responded on a scale (1-definitely false 7-definitely true). Barrier self efficacy was measured with 6 items and task efficacy was measured with 8 items and participants responded on a scale (1-not at all confident 7-completely confident). A higher score on each of the questionnaires indicated higher levels (e.g., greater intentions, self-efficacy, and action planning).

Measure to assess changes in all 6 motivational regulations as per self-determination theory asking reasons why individuals engage in exercise/physical activity during the intervention. Participants will respond to 23 items (e.g, "I don't see why I should have to exercise"), on a 5-point Likert scale ranging from 0 (not true for me) to 4 (very true for me), covering the types of motivational regulations on the self-determination continuum. The mean score of participants' autonomous and controlled motivation will be calculated. A higher mean score indicated a higher level of that type of motivation. Outcome measure data are not presented because of missingness.

Control Group: For participants assigned to the control group, they will be asked to continue with their regular routine for the next two months. Otherwise, the participants in this group will be asked to complete the follow-up baseline questionnaires at 6 and 10 weeks post-baseline. They will be contacted by a physical activity counsellor at the end of the 10-week period.