The survey by CareerBuilder, a Chicago human resources and recruitment firm, was conducted online by Harris Poll from Feb. 10 to March 17, and included 3,031 full-time workers in the U.S. age 18 and older. Overall, 25 percent of survey participants said they have employer-sponsored benefits — including some who have access to on-site workout facilities — but 55 percent of those people don’t use them. While lunchtime classes at two downtown Pittsburgh YMCA facilities are typically packed between 11 a.m.