I am a 18 year old boy...i am type of skinny..my wight is only 62kgs while i am almost 6ft 2inchs high..what should i do to improve my body conditions?

Fitness: Every doctor on healthtap will agree that health doesn't come from a pill bottle or magic food. You're not going to change your bone structure, though being tall is your good luck. Brad pitt, ewan mcgregor & many aerobic athletes have your body type. Hard weight training will build muscle; you can add creatine, extra protein & an electronic muscle stimulator to get more bulk if ok with your dr.