Delayed exercise condition. If randomized to the ‘delayed exercise’ condition, we ask that you make a strong effort not to change your exercise habits over the initial 12-week period. However, after the 12 weeks you will be given two options for increasing your exercise. Option 1: If you choose this option, you will receive one individual session with an exercise physiologist at our center and will be given an exercise prescription that you can do on your own. You will not come to any other visits at our center after that. Option 2: If you choose this option, you will be asked to commit to the same exercise program as described above in the ‘exercise’ condition. Thus, you will work your way up to 200 minutes/week of exercise over a 12-week period, you will be required to get a gym membership, and you will be asked to exercise at our center 2x/week for the first 4 weeks and once per week during the remaining weeks. You will receive the same compensation outlined above: reimbursed up to $120 in cash for gym fees, up to $120 in cash for meeting weekly exercise goals, and a $50 gift card if you average >180 min/week over the 12-week period. Thus by choosing option #2, you are committing to being in this study for an additional 12 weeks. Further, you will be asked to commit to doing additional assessments at 18 and 24 weeks (see below for more details). Assessment visits: Compliance to assessment procedures is extremely valuable in helping us to answer our research questions. Assessments will occur at baseline, mid-intervention (week 6) and post-intervention (weeks 11-12) for individuals randomized to both the exercise condition and the delayed exercise condition. For those ‘delayed exercise’ condition participants choosing Option #2 outlined above, additional assessments will occur mid-way through the exercise intervention (week 18) and at the end of the exercise intervention (weeks 23-24). Given the importance of these assessment measures, you will be compensated for your time for all assessments, except the baseline assessment. See below for a detailed description of all assessment measures at each time point as well as the compensation schedule. Baseline Assessment: At baseline, you will be asked to come to our center for approximately
