Loud music, dramatic lighting, those working out are bathed in orange and in sweat.
It kind of sounds like the latest night club, but it's a small fitness club off 169th and Burke near Village Pointe.
Kristi Wurgler had the reaction many did when she started Orange Theory.
"My first class here. It was really hard," she said.
Now, she's hooked.
"Great music, that gets you motivated," she said, "But what's so fun. Is you get into your own zone so you don't even pay attention to what is going on around."
The hook behind orange theory isn't just feeling like your in a club instead of a fitness club. The theory part comes in with high intensity training.
"What we're doing is basically climbing hills and coming down to an active recovery. Anybody can do something if you tell them for 60 seconds you're going to go at a high speed or high row. That is much more doable in your mind," head coach Cyndi Kammerer said.
Throughout those intense times, you have a heart monitor strapped around your chest or wrist. The heart rate is measured on a screen and put in one of five corresponding color zones. Orange, 85 percent, is the ideal zone.
"When we spend some many minutes in an elevated heart rate zone, that's we get the after burn effect. It is metabollically charging your body for up to 36 hours after the workout," Kammerer said.
The workout is just as much mental as physical. Coaches cheer you on as you go, which is just part of the reason why it's been catching on since the small gym opened last fall.
Kammerer says they plan to open another location somewhere in town within the next year, helping to make everyone's new favorite color orange.