I quit my job as a McKinsey consultant and started a company. This 19-second 'hack' helps me channel my confidence as a founder.

Lisa Sun is a former McKinsey consultant and the CEO of Gravitas.

Courtesy of Gravitas

• Lisa Sun, the CEO of Gravitas, uses a 7-5-7 breathing technique to boost confidence.
• The 7-5-7 method, inspired by yoga, helps release negativity and embrace positivity.
• Sun practices this technique before speeches and encourages her audiences to join her.

This as-told-to essay is based on a conversation with Lisa Sun, the 45-year-old CEO of Gravitas in NYC. It has been edited for length and clarity.