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, for our postscript "How You Built That," how Mike Sorentino developed the EyePatch Case, an iPhone case that cleans and protects the phone's built-in cameras.