hello vimaldev... how to build them?? simple... work-out!! get in the gym and if u cant, work-out in your house...how?? make some push-ups, pull-ups, running, squats, abs work!! if u have weights better, u will be able to work even better your bicps triceps shoulders legs abs chest and back!!
that will work for u im sure, but remember, dnt stay there, after a while, u will have to increase your challenge and do a harder rutine and harder work-outs!!
good luck and take care