Hot New Spa Treatment: Lava Shell Massage

Hot stone massage is so popular it's on almost every spa menu. But some spas are dropping it in favor of Lava Shell Massage. The big advantage for spas is that the prep and clean-up is much easier. But how is it for spa-goers? As good as hot stone? Better? Or just different? I had a chance to find out when I took a "Walk On The Beach" at The Four Seasons Resort Aviara, thirty minutes north of San Diego.