• Amount of moderate physical activity
  
• Physical activity behavior
  
• Fitness
  
• Selected cognitive-behavioral mediators (measured by physiologic testing and self-report at Month 3, and at a 3-month follow-up evaluation)
  

• Blood pressure control
  
• Preventive service utilization (measured at Month 3, and at a 3-month follow-up evaluation)
  

The main objective of this study is to determine, via a 6-month randomized controlled study, the efficacy of providing tailored physical activity computer reports to patients and physicians. The primary outcome will be minutes of physical activity of at least moderate intensity, assessed after a 3-month intervention and subsequent 3 months of follow-up. This study will examine the effect of the intervention on fitness, measured as V02 peak, which is the maximum amount of oxygen consumption a person can achieve. This study will examine potential mediators of physical activity participation, with particular attention to the effect of health outcome expectations for exercise as a potential mediator of exercise adoption. Another objective of the study is to test methods to improve blood pressure control and preventive service utilization.

Inclusion Criteria:

• Ability to speak and read English
• Current patient of a physician participating in this study (if selecting a new physician, may deliberately select one that is involved in the study, in order to participate)
• Ability to complete all written surveys
• Accessible for follow-up telephone surveys
• Ability to undergo exercise testing

Exclusion Criteria:

• Currently participating in another research study
• Planning to move out of the Philadelphia area
• Unable to walk without pain
• Pregnant or planning to become pregnant in the year following study entry
• Excessive drinking
• Coronary heart disease
• Congestive heart failure
• Peripheral vascular disease
• Cerebrovascular disease
• Chronic obstructive pulmonary disease
• Arrhythmia
• Recurrent seizures
• Dizziness
• Balance problems
• Psychoses