Lay the person on a flat surface, and place the heel of your hand into the persons chest, in between the nipples, and place the other hand on top of it. Push straight down about 2 inches and go at a rate of 100 compressions per minute
If you are trained in CPR, and have performed 30 chest compressions, put your palm gently on the persons forehead, and tilt the head back, with the other hand, gently lift the chin forward.
"With the airway open, pinch the nostrils shut for mouth-to-mouth breathing and cover the person's mouth with yours, making a seal"(unit8). Prepare to give two breaths, each lasting one second. If when you give the first breath you see the chest rise, give the second. If not, use the airway method then give the second breath.