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Since the arrival of smartphones, apps have been changing the way we conduct our lives. What once called for stationery now uses an Evite. What used to require lugging around a lighting kit and bulky camera now just takes a simple Instagram filter. And while some apps are for fun or killing time (Candy Crush, I just can't quit you), others aim to turn your life into one never-ending New Year's resolution by encouraging you to be the best version of yourself. In the past, only Hollywood's elite could afford a dream team of people devoted to unearthing a better you, but now your smart phone contains every therapist, personal trainer, nutritionist, stylist and life coach you'll ever need to become your best self.