With all due respect, chest compressions are done in the event of no breathing and no pulse at all and that's exactly what I am stating here. Check out the previous line that states (do CPR if the victim is not breathing). Doing chest compressions is another option in case there is no pulse. Further, the other option you've got is the use of automated external defribillator. You don't do EVERYTHING at once. You try one of the options to save a life. Either you do a CPR, OR you do a chest compression (note: in the event of no pulse) OR use an automated external defribillator. Thank you.