File:Chest-compression-hand-placement.jpg - Wikimedia Commons

Identifying the optimal hand placement site for chest compression by measuring hand width and sternal length in young adults - ScienceDirect

CPR in Adults: Positioning Your Hands for Chest Compressions Video & Image

File:Nazi tin soldiers.jpg - Wikimedia Commons

File:Iver Johnson Safety Hammer in original box.jpg - Wikimedia Commons

File:2002 CPR Technique.jpg - Wikipedia

Figure: Doing Chest Compressions in an Adult - Merck Manuals Consumer Version

Chest Compressions

File:CPR 2.jpg - Wikimedia Commons

a) Regions in the central and peripheral vision. Image from Wikimedia

File:Cheese Grater.jpg - Wikipedia