 The purpose of the study is to address 3 main sets of questions in the bariatric surgery population. 1 Does bariatric surgery, without any other intervention, lead to increased physical activity and improved physical fitness? 2 Does wearing a pedometer lead to increased physical activity in obese individuals prior to andor after bariatric surgery? Does the increased activity result in improvements in physical fitness? 3 Does physical activity counseling increase physical activity prior to and orafter bariatric surgery? Does the increased activity result in improvements in physical fitness? The overall goal of the study is to determine the impact of bariatric surgery on physical activity and assess the utility of additional interventions to help postoperative patients adopt a more active lifestyle. Participants are randomized to usual care, pedometer use, or pedometer use plus exercise counseling before and for the first 6 months after bariatric surgery. In an extension of the primary study, from 1 to 5 years after surgery, all patients receive exercise counseling. Physiological measures will be assessed to determine whether bariatric surgery andor improved physical activity levels result in improved physical fitness. 