Indianapolis Colts quarterback Andrew Luck has led the Colts to a 4-1 record in his second season. He's likely the best young quarterback in football. And yet, he hasn't enjoyed the visibility of some of his fellow young quarterbacks, such as Robert Griffin III or Colin Kaepernick. That's partly by design. Luck has been held back from glitzy commercial deals in favor of more "creative" endeavors, he said.

On Thursday, he announced a partnership with MC10, a tech startup that makes a sensor that can fit inside a football...