From Dr Dave: One of many commentaries by Dr Dave on Health and Wellness. He is grateful for having worked for and being taught by Harry Seftel and says "Everything that I have done reflects the incredible influence he (Harry) had on my life".  By the way if you want to see more of his health advice just search David Lipschitz on YouTube. 

NB. Done by a professional under controlled conditions. Do not perform at home alone.