After noticing more and more people sign up for yoga in the late 1990s, Chip Wilson bet everything on an athletic apparel company aimed toward young professional women. What started as a small pop-up store in Vancouver eventually became the multibillion-dollar brand Lululemon Athletica, spawning a new fashion trend and forever changing what women wear at the gym. PLUS in our post-script "How You Built That," we check back with Kate Westervelt who took an overwhelming experience and turned it into a gift box for new moms--filled with essential items women need to recover from childbirth