Extreme spa experiences are replacing the older, simpler days of a back rub and a few candles. Now tense clients can demand wooden hammers, snowflake rooms, and “vibroacoustic” contraptions. Wendy Bounds gets the lowdown from Kristen Bellstrom. Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM