This study was designed to determine if physical activity levels were significantly different between students in seventh and eighth grade. Another purpose of the study was to examine if physical activity habits correlated with measures of cardiovascular endurance. Physical activity habits among the subjects were measured with a 38-item questionnaire and cardiovascular endurance was assessed using the Progressive Aerobic Cardiovascular Endurance Run (PACER). The sample of 82 students who completed the study was from a suburban middle school in New Jersey. Data collected from this research study found that the difference between seventh and eighth grade physical activity levels was insignificant in most cases. The only significant reduction in physical activity (alpha at .10) was found between the seventh and eighth grade female group who performed 20 minutes or more of vigorous physical activity (p-value = .053). Although a slightly stronger correlation existed between the amount of vigorous physical activity performed and PACER scores, as compared to the relationship between moderate activity and PACER results, both relationships were found to be low. Other questions from the physical activity questionnaire relating to self-motivation and desire displayed moderate correlations (.05242) to PACER scores. Results also found a moderate correlation between the number of sports teams subjects participated on and PACER test scores (0.5097). Although some moderate correlations were concluded, the relationship between PACER scores and moderate and vigorous physical activity were determined to have poor correlations.