An ECG or electrocardiogram, is used to check for problems in the heart –specifically in relation to the electrical activity. During a resting ECG, your doctor will ask you to lie down. It is important that there is no movement during this test, as your muscles may generate electrical impulses that can interfere with the impulses generated by the heart. In order to conduct the test, your doctor will stick small electrodes on your chest, which will connect to an electrocardiograph (ECG). This ECG procedure will measure your heart's activity to see what the rate and regularity of your heartbeat is.