1. CEO Calvin McDonald will step down on January 31 after underperformance. 2. Lululemon's business is pressured by tariffs and decreased U.S. consumer spending. 3. Competition is rising from brands like Vuori and Alo Yoga. 4. Lululemon's growth is driven by international expansion and new store openings. 5. The ending of de minimis exemption may cost $240 million in profits.