Lululemon Athletica (LULU) stock is trading lower Friday after the athleisure apparel company reported second-quarter results that were mixed compared with analysts' expectations and lowered its full-year outlook.In the quarter ended July 28, Lululemon's revenue increased 7.3% year-over-year to $2.37 billion, driven by a 29$3.15."In the second quarter, Lululemon delivered revenue and earnings growth, with on ...