Keys Fitness Products company manufactures the treadmills, Keys Fitness Products also makes exercise bikes, ellipticals, steppers, home gyms, and other exercise equipment. The company sells its products through more than 3,000 retailers in the US, as well as stores in more than 30 other countries. Brand names include CardioMax, Power System HealthTrainer, Ironman, Keys, and Karen Voight. The company was founded in 1988 by CEO Tim Chen as an import business. In 2008 Keys Fitness filed for Chapter 11 bankruptcy protection.