firstly you should make your digestive capacity clear if any problem is there by using purgation treatment(agasthyar kuzhambu-100mg + trikadugu choornam),then amukkura lehyam,kooshmanda rasayanam like medicines in ayurveda you can take along with milk
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get a medical check up to confirm that no illness is there
physical exercises and balanced healthy high protein diet for wait gain and muscle building
for muscle building you will have to do power exercises with weights
attend gym and take guidance
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