The most frequent subconscious activity repeated by the human body is blinking.

The story behind the answer

False—your heartbeat is more frequent than blinking. Adults typically blink about 10–20 times per minute (even fewer when reading or using screens), while the heart beats around 60–100 times per minute at rest. That makes the heartbeat several times more frequent and still largely subconscious, driven by the heart’s natural pacemaker (the sinoatrial node) and regulated by the autonomic nervous system.

Blinking is a protective reflex that spreads tears to keep the cornea moist and clear, and