The Delayed-start group will maintain their regular daily activities, and be provided with a copy of the Pilates DVD following the intervention, for their own use.

The 20-item State and Trait subscales of the widely used and well-validated STAI will assess anxiety. Participants rate each item using a 4-point Likert scale, from 1 "Not at all" to 4 "Very much so". Total score ranges from 20-80; higher scores indicate greater anxiety. The STAI has well-documented psychometric properties in people with MS.

The 20-item State and Trait subscales of the widely used and well-validated STAI will assess anxiety. Participants rate each item using a 4-point Likert scale, from 1 "Not at all" to 4 "Very much so". Total score ranges from 20-80; higher scores indicate greater anxiety. The STAI has well-documented psychometric properties in people with MS.

The 20-item State and Trait subscales of the widely used and well-validated STAI will assess anxiety. Participants rate each item using a 4-point Likert scale, from 1 "Not at all" to 4 "Very much so". Total score ranges from 20-80; higher scores indicate greater anxiety. The STAI has well-documented psychometric properties in people with MS.

The 20-item State and Trait subscales of the widely used and well-validated STAI will assess anxiety. Participants rate each item using a 4-point Likert scale, from 1 "Not at all" to 4 "Very much so". Total score ranges from 20-80; higher scores indicate greater anxiety. The STAI has well-documented psychometric properties in people with MS.

The 20-item State and Trait subscales of the widely used and well-validated STAI will assess anxiety. Participants rate each item using a 4-point Likert scale, from 1 "Not at all" to 4 "Very much so". Total score ranges from 20-80; higher scores indicate greater anxiety. The STAI has well-documented psychometric properties in people with MS.

The 7-item anxiety and depression subscales of the 14-item HADS measures anxiety and depressive symptoms in the prior week. Subscale scores range from 0-21 with higher scores indicative of greater anxiety and depressive symptoms, and validated cut-scores ≥8 classify anxiety and depression caseness. The HADS has demonstrated reasonable psychometric properties among people with Multiple Sclerosis, demonstrating acceptable sensitivity (90% and 89% for the depression subscale) and specificity (87% and 81% for the anxiety subscale).

The 7-item anxiety and depression subscales of the 14-item HADS measures anxiety and depressive symptoms in the prior week. Subscale scores range from 0-21 with higher scores indicative of greater anxiety and depressive symptoms, and validated cut-scores ≥8 classify anxiety and depression caseness. The HADS has demonstrated reasonable psychometric properties among people with Multiple Sclerosis, demonstrating acceptable sensitivity (90% and 89% for the depression subscale) and specificity (87% and 81% for the anxiety subscale).

The 7-item anxiety and depression subscales of the 14-item HADS measures anxiety and depressive symptoms in the prior week. Subscale scores range from 0-21 with higher scores indicative of greater anxiety and depressive symptoms, and validated cut-scores ≥8 classify anxiety and depression caseness. The HADS has demonstrated reasonable psychometric properties among people with Multiple Sclerosis, demonstrating acceptable sensitivity (90% and 89% for the depression subscale) and specificity (87% and 81% for the anxiety subscale).

The 7-item anxiety and depression subscales of the 14-item HADS measures anxiety and depressive symptoms in the prior week. Subscale scores range from 0-21 with higher scores indicative of greater anxiety and depressive symptoms, and validated cut-scores ≥8 classify anxiety and depression caseness. The HADS has demonstrated reasonable psychometric properties among people with Multiple Sclerosis, demonstrating acceptable sensitivity (90% and 89% for the depression subscale) and specificity (87% and 81% for the anxiety subscale).

The 7-item anxiety and depression subscales of the 14-item HADS measures anxiety and depressive symptoms in the prior week. Subscale scores range from 0-21 with higher scores indicative of greater anxiety and depressive symptoms, and validated cut-scores ≥8 classify anxiety and depression caseness. The HADS has demonstrated reasonable psychometric properties among people with Multiple Sclerosis, demonstrating acceptable sensitivity (90% and 89% for the depression subscale) and specificity (87% and 81% for the anxiety subscale).

The 16-item QIDS will assess depressive symptom severity across nine core criteria for depression, based on the prior week. Participants will rate severity and frequency of specific symptoms experienced in the prior week. Total scores range from 0-27, with a higher score illustrating more symptom severity. Scores >5 indicate at least mild depression. The QIDS is a valid measure to quantify depressive symptoms with good sensitivity and specificity among people with Multiple Sclerosis.

The 16-item QIDS will assess depressive symptom severity across nine core criteria for depression, based on the prior week. Participants will rate severity and frequency of specific symptoms experienced in the prior week. Total scores range from 0-27, with a higher score illustrating more symptom severity. Scores >5 indicate at least mild depression. The QIDS is a valid measure to quantify depressive symptoms with good sensitivity and specificity among people with Multiple Sclerosis.

The 16-item QIDS will assess depressive symptom severity across nine core criteria for depression, based on the prior week. Participants will rate severity and frequency of specific symptoms experienced in the prior week. Total scores range from 0-27, with a higher score illustrating more symptom severity. Scores >5 indicate at least mild depression. The QIDS is a valid measure to quantify depressive symptoms with good sensitivity and specificity among people with Multiple Sclerosis.

The 16-item QIDS will assess depressive symptom severity across nine core criteria for depression, based on the prior week. Participants will rate severity and frequency of specific symptoms experienced in the prior week. Total scores range from 0-27, with a higher score illustrating more symptom severity. Scores >5 indicate at least mild depression. The QIDS is a valid measure to quantify depressive symptoms with good sensitivity and specificity among people with Multiple Sclerosis.

The 16-item QIDS will assess depressive symptom severity across nine core criteria for depression, based on the prior week. Participants will rate severity and frequency of specific symptoms experienced in the prior week. Total scores range from 0-27, with a higher score illustrating more symptom severity. Scores >5 indicate at least mild depression. The QIDS is a valid measure to quantify depressive symptoms with good sensitivity and specificity among people with Multiple Sclerosis.

The 21-item MFIS is a recommended core outcome measure in exercise studies in people with Multiple Sclerosis, that measures physical, cognitive and psychosocial components of fatigue. Participants respond to "how often fatigue has affected you in this way during the past 4 weeks", using a 5-point Likert scale ranging from 0 (Never) to 4 (Almost Always). Physical subscale scores range from 0 to 36, Cognitive from 0 to 40, and Psychosocial from 0 to 8. Total MFIS scores (0 to 84), is computed by summing physical, cognitive, and psychosocial subscale scores, with a higher score indicating greater impact of fatigue on participant activities. A total fatigue cut-off score of ≥38 distinguishes between fatigued and non-fatigued individual. It has been proposed by the Multiple Sclerosis Council for Clinical Practice Guidelines as a reliable assessment tool of perceived fatigue (1998), with excellent test-retest reliability, and good correlation with the Fatigue Severity Scale.

The 21-item MFIS is a recommended core outcome measure in exercise studies in people with Multiple Sclerosis, that measures physical, cognitive and psychosocial components of fatigue. Participants respond to "how often fatigue has affected you in this way during the past 4 weeks", using a 5-point Likert scale ranging from 0 (Never) to 4 (Almost Always). Physical subscale scores range from 0 to 36, Cognitive from 0 to 40, and Psychosocial from 0 to 8. Total MFIS scores (0 to 84), is computed by summing physical, cognitive, and psychosocial subscale scores, with a higher score indicating greater impact of fatigue on participant activities. A total fatigue cut-off score of ≥38 distinguishes between fatigued and non-fatigued individual. It has been proposed by the Multiple Sclerosis Council for Clinical Practice Guidelines as a reliable assessment tool of perceived fatigue (1998), with excellent test-retest reliability, and good correlation with the Fatigue Severity Scale.

The 21-item MFIS is a recommended core outcome measure in exercise studies in people with Multiple Sclerosis, that measures physical, cognitive and psychosocial components of fatigue. Participants respond to "how often fatigue has affected you in this way during the past 4 weeks", using a 5-point Likert scale ranging from 0 (Never) to 4 (Almost Always). Physical subscale scores range from 0 to 36, Cognitive from 0 to 40, and Psychosocial from 0 to 8. Total MFIS scores (0 to 84), is computed by summing physical, cognitive, and psychosocial subscale scores, with a higher score indicating greater impact of fatigue on participant activities. A total fatigue cut-off score of ≥38 distinguishes between fatigued and non-fatigued individual. It has been proposed by the Multiple Sclerosis Council for Clinical Practice Guidelines as a reliable assessment tool of perceived fatigue (1998), with excellent test-retest reliability, and good correlation with the Fatigue Severity Scale.

The 21-item MFIS is a recommended core outcome measure in exercise studies in people with Multiple Sclerosis, that measures physical, cognitive and psychosocial components of fatigue. Participants respond to "how often fatigue has affected you in this way during the past 4 weeks", using a 5-point Likert scale ranging from 0 (Never) to 4 (Almost Always). Physical subscale scores range from 0 to 36, Cognitive from 0 to 40, and Psychosocial from 0 to 8. Total MFIS scores (0 to 84), is computed by summing physical, cognitive, and psychosocial subscale scores, with a higher score indicating greater impact of fatigue on participant activities. A total fatigue cut-off score of ≥38 distinguishes between fatigued and non-fatigued individual. It has been proposed by the Multiple Sclerosis Council for Clinical Practice Guidelines as a reliable assessment tool of perceived fatigue (1998), with excellent test-retest reliability, and good correlation with the Fatigue Severity Scale.

The 21-item MFIS is a recommended core outcome measure in exercise studies in people with Multiple Sclerosis, that measures physical, cognitive and psychosocial components of fatigue. Participants respond to "how often fatigue has affected you in this way during the past 4 weeks", using a 5-point Likert scale ranging from 0 (Never) to 4 (Almost Always). Physical subscale scores range from 0 to 36, Cognitive from 0 to 40, and Psychosocial from 0 to 8. Total MFIS scores (0 to 84), is computed by summing physical, cognitive, and psychosocial subscale scores, with a higher score indicating greater impact of fatigue on participant activities. A total fatigue cut-off score of ≥38 distinguishes between fatigued and non-fatigued individual. It has been proposed by the Multiple Sclerosis Council for Clinical Practice Guidelines as a reliable assessment tool of perceived fatigue (1998), with excellent test-retest reliability, and good correlation with the Fatigue Severity Scale.

This measures the approximate number of hours the subject slept and how much time they engaged in moderate, hard, and very hard activity. It is a valid measure used extensively in MS research, and has demonstrated high test-retest reliability.

This measures the approximate number of hours the subject slept and how much time they engaged in moderate, hard, and very hard activity. It is a valid measure used extensively in MS research, and has demonstrated high test-retest reliability.

This measures the approximate number of hours the subject slept and how much time they engaged in moderate, hard, and very hard activity. It is a valid measure used extensively in MS research, and has demonstrated high test-retest reliability.

This is a self-report measure of physical activity in persons with multiple sclerosis. Its validity is well established in MS, and it is sensitive to change following active interventions. Frequency of strenuous (e.g., running or jogging), moderate (e.g., fast walking, easy swimming), and mild (e.g., easy walking) exercise performed for more than 15 minutes during leisure time over a usual week was recorded. Total weekly leisure activity scores were calculated as follows, (strenuous x 9) + (moderate x 5) + (mild x 3). Scores (>=24) indicate activity levels to provide substantial benefits towards overall health contribution.

This is a self-report measure of physical activity in persons with multiple sclerosis. Its validity is well established in MS, and it is sensitive to change following active interventions. Frequency of strenuous (e.g., running or jogging), moderate (e.g., fast walking, easy swimming), and mild (e.g., easy walking) exercise performed for more than 15 minutes during leisure time over a usual week was recorded. Total weekly leisure activity scores were calculated as follows, (strenuous x 9) + (moderate x 5) + (mild x 3). Scores (>=24) indicate activity levels to provide substantial benefits towards overall health contribution.

This is a self-report measure of physical activity in persons with multiple sclerosis. Its validity is well established in MS, and it is sensitive to change following active interventions. Frequency of strenuous (e.g., running or jogging), moderate (e.g., fast walking, easy swimming), and mild (e.g., easy walking) exercise performed for more than 15 minutes during leisure time over a usual week was recorded. Total weekly leisure activity scores were calculated as follows, (strenuous x 9) + (moderate x 5) + (mild x 3). Scores (>=24) indicate activity levels to provide substantial benefits towards overall health contribution.

This is a self-report measure of physical activity in persons with multiple sclerosis. Its validity is well established in MS, and it is sensitive to change following active interventions. Frequency of strenuous (e.g., running or jogging), moderate (e.g., fast walking, easy swimming), and mild (e.g., easy walking) exercise performed for more than 15 minutes during leisure time over a usual week was recorded. Total weekly leisure activity scores were calculated as follows, (strenuous x 9) + (moderate x 5) + (mild x 3). Scores (>=24) indicate activity levels to provide substantial benefits towards overall health contribution.

This is a self-report measure of physical activity in persons with multiple sclerosis. Its validity is well established in MS, and it is sensitive to change following active interventions. Frequency of strenuous (e.g., running or jogging), moderate (e.g., fast walking, easy swimming), and mild (e.g., easy walking) exercise performed for more than 15 minutes during leisure time over a usual week was recorded. Total weekly leisure activity scores were calculated as follows, (strenuous x 9) + (moderate x 5) + (mild x 3). Scores (>=24) indicate activity levels to provide substantial benefits towards overall health contribution.