Procedure Summary. Patients who are eligible are consented by the research coordinator, after which a baseline assessment will be scheduled. The baseline assessment requires 60 minutes and includes questionnaires, height/weight, dual energy x-ray absorptiometry (DEXA), and phlebotomy. Participants will also wear the Fitbit for one week to establish baseline activity level. After the baseline assessment, women are then randomly assigned to: the 12-week "Stay on Track" lifestyle intervention or the 12-week self-guided control. Both groups complete a post-intervention and a 3-month follow-up visit identical to their baseline assessment. Self-guided controls can utilize their Fitbit and will receive informative binders 24 weeks' post-intervention.