The key action to ensure during high‑quality CPR on an adult is that you are pushing hard and fast in the center of the chest at the correct rate and depth, with full chest recoil and minimal interruptions. In exam-style wording, this is often captured as:

Ensure that chest compressions are being delivered at a rate of about 100–120 compressions per minute and a depth of about 2 inches (5 cm), allowing the chest to fully recoil between compressions and keeping pauses as short as possible.