This premium athleisure brand must try desperately to win back shareholders.Lululemon Athletica (LULU -18.59%) certainly isn't winning over the market these days. After providing a disappointing second-quarter 2025 (ended Aug. 3) financial update, shares have cratered. They fell 19% the following day.Despite the fall, here's one reason that every investor should know about Lululemon. Selling on the discount rackLululemon is known for selling expensive athletic apparel and footwear. It's positioned at the pr ...