Subjects will be randomly assigned to either the CON or CRH group. Subjects assigned to the CON will receive treatment for their RA that is considered standard care (e.g. pharmacotherapy), but will not be enrolled in the CR program. Subjects in the CON group will be asked to maintain their current level of PA during the course of the 12-week study. CON subjects will be given a log book to record their daily activity as well as report any significant changes in their PA level that occur during the study. Subjects assigned to the exercise group (CRH) will receive standard care for RA plus be enrolled in a CR program (Community Cardiovascular Hearts Motion Program, Halifax Regional Municipality, NS). The CR program is 12-weeks in duration and will be supervised by a nurse, a physiotherapist and a research assistant. The CR program is composed of one 60 minute education session per week and two 60 minute exercise sessions. The education sessions will be conducted by a multidisciplinary team of health professionals (nurse, physiotherapist and dietician). Topics covered include heart healthy eating, setting health-related goal, exercise, nutrition, healthy weight, smoking cessation and stress/coping. Some education sessions will be modified to better suit RA subjects (e.g. CVD medication session). The exercise sessions are based on standard of care for CVD patients. Exercise sessions will begin with a group a warm-up activity, followed by 45 minutes of aerobic activity and ending with a cool down. Aerobic activity will consist of walking/running on a treadmill, stepping exercise and/or cycling on a cycle ergometer. The subject will be encouraged to rotate through the various exercise machines (e.g. 15 minutes treadmill, 15 minutes cycle, 15 minutes stepper). All aerobic exercise will be performed at high intensity, which for the present study is defined as exercise that elicits a HR between 60-80% of heart rate reserve (HRR). Subjects will keep a log book for the duration of the program that details their exercise sessions. Subjects will record resting heart rate, type of exercise performed, duration of the exercise and HR during the exercise sessions. The subject also may add any relevant notes. All exercise sessions will be closely monitored by a nurse, physiotherapist and a research assistant. Prior to the initial CR exercise session target heart rates will be calculated for each subject based on the maximum HR achieved during their stress test. Subjects will be taught how to palpate radial and/or carotid pulse during the first week of the CR program. This will enable the subject to monitor and maintain their HR within the target HR zone while performing their aerobic exercise.