In this shiur, Rabbi Aharon Walkin clarifies the detailed halachic discussions surrounding the blowing of teki'os on Rosh Hashanah. He explains the difference between nishima achas (one breath) and shtei nishimos (two breaths), how to fulfill all major opinions (Rishonim and Acharonim), and delves into what halacha considers a "breath"—including medical insights. Rabbi Walkin addresses the practices of the broader Jewish community (the Velt), the Chazon Ish's interpretation, and practical concerns for baalei teki'ah, such as maintaining blowing strength and angle. Key halachic sources like the Shulchan Aruch, Mishnah Berurah, and Gra are brought into the discussion for a comprehensive overview.