Imagine running up a hill, wanting to give up, and then hearing a personal trainer in your ear urging you to keep going. Would you? Ethan Agarwal, CEO of Aaptiv, joins Cheddar to discuss how his app is making it possible for people to get motivated during a running workout. So why audio over video? Agarwal says cardio is run on audio. People don't want to watch videos while running, so he believes using data to create a personal trainer in your ear is the future of working out. The company just raised $38 million dollars, and will be using it to enhance both the app's user experience and marketing efforts. However, when asked about acquisitions and mergers, Agarwal said he's on the IPO path. He wants to build a personal fitness empire catering to one of the largest fitness demographics: runners.