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This started as a fun side project, but we turned it into a real business. >> Meet Brian. Him and his girlfriend built a really simple mobile app, and in less than 3 months, they grew it to over $20,000 a month. >> We set a number and didn't start building until we hit it. >> You might think he validated the idea like everyone else, but no. He did something I've never seen before, and it's called the commitment metric. >> We made sure that people committed to this product