Our six-week study, conducted in the summer of 2010, used a quasi-experimental, interrupted time-series research design. Individuals who lived and worked on the unit were participants. Stair use was measured by an infrared motion sensor and by systematic behavioral observations during three study phases—before, during, and after the installation of point-of-choice prompts. Elevator use was measured only by observation. No significant change in the overall number of stair users was noted over the three phases. Logistic regression analysis of observational data did not find an effect of sex or hospital status (whether participants lived or worked at the hospital) on stair or elevator use. Although patients did not change their stair use behavior, male employees and male volunteers significantly increased stair use over the study period (N=133, χ2=13.4, df=2, p=.001).