Hi Thanks for contacting HCM Your height is 6 and weight is 66 kg , i.e., your bmi ( body mass index) is 9. This body mass index calculator is based on the standard BMI measurement that takes your weight and height and basically tells you if you have an unhealthy body weight. It works for adults, both men and women above age 19. Endura mass contains balanced formulation of high quality soy proteins, carbohydrates, fats, minerals and vitamins. which will helps you gain weight. If gymming is supervised by Physiotherapist than only it is ok, untrained person will never guide for gymming because he/she doesn t know anatomy a and physiology of human body. In my opinion continue your endura massand take some boiled egg if you are non vegetarian .otherwise 100 gm of paneer . 1/2 ltr of Milk in daily diet. Ifyou are not responding to weight gain then consult to Doctor near by your are some investigation and family history is needed to rule out any disease. Thanks