What is the correct position for delivering chest compressions?

Delivering chest compressions is most effective when performed on a hard surface. This ensures that the compressions can be delivered with the necessary depth and force, significantly increasing the chance of restoring adequate blood flow during cardiac arrest. A hard surface allows for proper recoil of the chest between compressions, which is essential for maximizing blood return to the heart and maintaining circulation.

When compressions are delivered on a soft surface, such as a mattress or sofa, the compressions may not achieve the required depth, thereby reducing their effectiveness. Additionally, compressing on a victim's side or in a seated position compromises the ability to perform high-quality compressions, as these positions do not allow for the proper mechanics and positioning needed to generate the force essential for effective resuscitation.