Solar plexus tapping is a percussive self-massage technique applied to the soft triangle just below the sternum, where the ribcage divides. The solar plexus (technically the celiac plexus) sits at the junction of the sympathetic and parasympathetic nervous systems, and in yogic tradition marks the third chakra, the seat of personal agency and the capacity to act from one's own centre. 

Tapping here stimulates vagal tone and engages the enteric nervous system, making it a direct entry point for stress relief and nervous system regulation at any point of acute overwhelm during the day, not only within a formal practice. It also improves circulation to the digestive organs, which matters in Cancer season, as our stomachs so often gets affected when we have a lot on our minds.