The International SPA Association (ISPA) has released its annual findings of the “Big Five”—total revenue, spa visits, spa locations, revenue per visit and number of employees for the US spa industry.   “The data continues to show a healthy and robust spa industry resulting in a wealth of reputable career opportunities for those looking to find a stable work environment,” said ISPA president Lynne McNees. “This study celebrates eight consecutive years of revenue growth with total spa industry ...