The International SPA Association (ISPA) recently released key statistics from the ISPA 2013 U.S. Spa Industry Study. According to the study, total revenue, spa visits, revenue per visit, and the total number of employees and spa locations all experienced an increase over the previous year. The continuous growth of the spa industry has positively impacted the United States economy, generating 14 billion dollars in revenue in 2012. Want to read more? Subscribe to one of our monthly plans to continue reading this article.