There has been an increased emphasis on the development of "lifestyle" interventions to increase physical activity. Such interventions have been shown to be as effective as structured exercise programs in increasing physical activity levels and in reducing blood pressure (Dunn, et al., 1999) and body fat (Anderson, et al., 1999). Because pedometers are simple, relatively inexpensive and easy to use, recent researchers have suggested the use of pedometers in lifestyle physical activity interventions (Freedson & Miller, 2000; Dunn, Anderson, & Jakicic, 1998; Tudor-Locke, 2001). Pedometers have been used as an objective measure of physical activity (Tudor-Locke, et al., 2002; Tudor-Locke, 2001; Bassett, Cureton & Ainsworth, 2000) and, most recently, in intervention studies (Moreau, et al., 2001; Speck & Looney, 2001). This study investigated the effects of an 8-week pedometer-based lifestyle physical activity intervention on physical activity and body mass index (BMI). Subjects were 37 employees (28 females, 8 males) of a small northeast private college who volunteered to participate in the study. Ages ranged from 23-64 years, with a mean age of 44.3 +/- 9.3 years. The intervention consisted of goal-setting, self-monitoring and weekly email reminders/information. Physical measures included height, weight, BMI, and 7-day pedometer-assessed physical activity. Survey measures included 7-day physical activity recall (PAR) (Godin & Shephard (1985), and perceived benefits/barriers to physical activity (PBBPA), adapted from Steinhardt and Dishman's (1989), "Expected Outcomes and Barriers for Habitual Physical Activity Scales". A t-test for paired samples was used to determine changes in physical tests and survey scores. Results indicate a significant increase in average daily steps (p < 0.01), from a mean of 8479 (+/- 3100) steps at baseline to 10505 (+/- 3634) steps post-program, a 24% increase. Scores on the PAR also improved significantly (p < 0.05) from baseline to post-program. While reductions in BMI were statistically significant (p < 0.05) for the group (27.7 baseline to 27.4 post-program), those reductions can be attributed to the weight loss of 6 subjects who participated in a diet program. There were no significant differences in PBBPA survey scores. This study indicates that the pedometer-based physical activity intervention was effective in increasing the daily physical activity of participants, as indicated by pedometer and survey measures. As physical-activity induced weight loss takes a period of time to take effect, it is recommended that future studies examine interventions of longer duration. Use of a control group and larger sample sizes are also recommended.