Acharya Prashant explains that body language is a direct reflection of the mind and cannot be rehearsed or manipulated through external formulas. He questions the need for pre-planned gestures, noting that when the mind is attentive, natural, and free from fear, the body follows suit without effort. He argues that trying to project confidence while the mind is trembling leads to a lack of authenticity, as the body cannot be cheated. True presence arises from being in the moment rather than following pre-installed software or social scripts.