America and reinstating the draft?

what if America needed to bring back the draft if there was a real need for it like ww3 or a war with china,there would be a huge problem i read somewhere that like 60% of eligible males for the draft are too overweight to be considered for conscription,so my question is how would the military adapt to that if there is a real need for men,would they just only search for the in shape people and send them in first cuz that seems unfair all the in shape guys like me would be sent in first while the fat f**ks get out of it.