I am 6 ft in height , 20 years of age and i only weigh 55 , I want to gain weight.. due to over burden of college tests, exams etc it is not possible for me to go to gym , can u suggest me some daily protien powder or something that i can mix with milk or water and drink everyday , i can do the regular workout (push ups, squats etc in my room itself) I just want anything that can increase my weight in the long term and i can take it everyday without side effects.