This study will be a prospective open label with blinded evaluation (PROBE) trial and randomize the participants into one of the following four treatment arms:

Aerobic exercise and health behaviour support: Participants will undergo aerobic exercise training for 6 months and will receive 1-year of individually tailored telephone support after the intervention.

Aerobic exercise and no health behaviour support: Participants will undergo aerobic exercise training for 6 months and will not receive health behaviour support during the follow-up 1-year follow-up period (at 18 months).

Stretching-toning and health behaviour support: Participants will undergo stretching-toning exercise training and will receive 1-year of individually tailored telephone support after the intervention.

Stretching-toning and no health behaviour support: Participants will undergo stretching-toning exercise training and will not receive health behaviour support during the follow-up 1-year follow-up period (at 18 months).

Randomization sequence within blocks will be generated by computer using a random number generator. Randomization will be stratified by age (age > 65 vs ≤ 65 years) and sex with blocked, simple randomization into each of 4 strata for each group of participants as they enter the study. Because enrolment occurs in complete groups of participants (rather than sequentially), randomization will be done in complete blocks such that randomness of allocation is completely preserved. Specifically, recruitment for each study site (e.g., University of Calgary, YMCA Calgary) will be done independently. Once the desired number of participants (8–15 participants) are recruited, baseline testing will be conducted. Participants will be then randomized (the random sequence will be generated by computer: REDCap randomization tool) and immediately start the exercise intervention. Randomized allocation will be completely masked to all study personnel, except the database programmer (study coordinator) who will not participate in any participant or protocol-related activities. Participants will receive a “welcome package” containing their allocation group during the baseline testing visits, in advance of the exercise programme starting date.

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