But spas, lately, seem to be popping up everywhere: office buildings, strip malls, village storefronts. Salons with one tiny massage table tout their spa services. Even nail places call themselves spa pedicures. How can they all be spas?

For one thing, there are several different types of spas. The first kind is a destination spa. At a day spa you just drop in for treatments like massage, facials and body treatments Often, day spas are an extension of a hair salon, which is fine as long as the spa is a separate wing that offers a quiet, serene, environment.