Buried up to the neck in warm, fermented rice bran, a new generation of Koreans is sweating out the stress of daily life. Enzyme baths, a heat therapy long associated with middle-aged and older Koreans, are drawing customers in their 20s and 30s, who see the treatment as a way to reduce puffiness, flush out fatigue and recover from busy routines without breaking a sweat at the gym. The treatment involves lying in a bed of hinoki cypress sawdust, rice bran and medicinal herbs mixed with microorga