 - Participants in Group B will be allowed to exercise as much as they wish during the first 16-weeks of their time on the study, but they will not be given a formal exercise plan or a gym membership until the completion of the 16-week waiting period. During this time, they will also complete questionnaires at the time of study entry, 8 weeks after enrolling, and at the end of 16 weeks. After the 16-week delay period has passed, participants in Group B will be given a pedometer, heart rate monitor and 16-week gym membership. They will also meet with an exercise physiologist weekly for one month, and the exercise physiologist will design an individualized exercise plan for these participants. 