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I┬┤m an 18 year old boy, I weigh 63 kg and I┬┤m 1,86 cm tall; and therefore i have a BMI of about 17. This is too low and I don┬┤t believe its healthy. So I┬┤ve been trying to gain mass through hyper-caloric diets, but it looks like my metabolic rate is too high. So the last option I┬┤ve thought of is gaining that weight through muscle, but I have no idea on the most efficient way to do it in terms of workout and diet. I┬┤ll gladly appreciate any help 😀