be the example you want him to be '''EXERCISING I'M SWEATING, WOOOUUH!!!!!! EXERCISING I'M SWEATING, WOOOUUH!!!!!! ''' if it's a best friend he'll follow in due time put no pressure on him and refrain from shytting on food he likes to eat no man likes to be instructed, stop being overt about it period all your bearings has to be beyond suspicion, inch by inch.