Professor of medicine at Harvard University, said, practice meditation can reduce muscle tension, reduce the quantities of lactic acid in serum. Test shows that daily meditation practice 20 minutes a week, the concentration and emotional control have been improved, anxiety, depression, anger and other negative emotions are substantially reduced. Not only that, sit-training can also clear the brain's blood circulation, so that the brain response from the "fight or flight" to "accept reality" and thus enhance a person's happiness.