I can't understand “to your chest pressing” and "how effective you are'.
Check how effective you are seeing if his colour improves or his pulse becomes independent to your chest pressing.
---------------------
With arms straight, rock forwards, pressing down on the lower half of the breastbone. Don't be too hard or you may break a rib. Check how effective you are by seeing if his colour improves or his pulse becomes independent to your chest pressing. If this happens, stop the pressing. Otherwise continue until rescue arrives.--------------------
The question has been solved!!!!!!!!!!!!!!!!!!!!!