Entrepreneur Franchise 500 Rank: 19
Initial investment: $488,405 to $994,360
Initial franchise fee: $49,500
New units in 2016: 126 units (37.3 percent)
Orangetheory Fitness focuses on fitness classes that can include treadmills, rowing machines and free weights. The company, which was founded in 2010, also requires class participants to wear heart rate monitors, so they can see their health information during the workout.
Orangetheory is looking to add franchises in every state but Illinois, Tennessee and Arizona, as well as internationally in Canada, the U.K., Mexico, Colombia, Australia and the Dominican Republic.