A step above the rest

About Us.

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About Us

What is Fhitting Room?


Fhitting Room is a High Intensity Interval Training (HIIT) studio delivering a total body workout that’s a step above the rest. We’ve upgraded the group workout experience with better trainers and better programming to deliver better results. Smaller class sizes allow our caring and credentialed instructors to treat everyone like a VIP. Consider them your personal trainers.

About Us

The Science Behind HIIT.

Research proves that High Intensity Interval Training (HIIT) is the most effective method to increase endurance and build strength.

The Workouts

The Best of Both Worlds.

Our workouts will increase your endurance and make you stronger at the same time. Studies indicate as little as 27 minutes of HIIT three times per week produces the same anaerobic and aerobic improvement as 60 minutes of steady state cardio five times per week, so you can have more time for everything else in your life!

Our Story

About Us.

Fhitting Room started with an unshakeable desire to combine the results and safety of personal training sessions with the motivation, energy, and fun of group fitness.

Prior to creating Fhitting Room, our founder, Kari, was a recent Harvard Business School grad with an exciting marketing career at Pepsi Co. She focused on building equity for powerhouse brands and launching new product innovations.
In 2007, she left the world of boardrooms and bubbles and entered the world of diapers and sleepless nights. Exhausted and time-starved, Kari began High-Intensity Interval Training (HIIT) as a means to work off her pregnancy weight in her scarce free time. As someone who hasn’t always loved exercise, Kari was blown away by the physical and emotional results of HIIT and the efficiency of her new, only 2x weekly, workout routine.
Around this time, specialized boutique fitness studios started popping up, and people were getting instantly hooked on the fun, social dynamic classes provided. Kari loved the idea of working out with friends, but couldn’t find a studio that offered functional HIIT workouts with enough personal attention from certified trainers. Her friends were taking classes 2-3x weekly and seeing personal trainers 1-2x per week. It was a time consuming and expensive practice.
Kari took her love of planning unique consumer experiences and finding creative solutions to develop a new way for anyone to access the benefits of a personal training session in a kick-ass, motivational group setting. This “Gym Idea” became the subject line of an email Kari sent in 2012 to one her best friends, and now Fhitting Room Chief of Deets & Peeps, Jessica. Our first location opened in a small studio on Manhattan’s Upper East Side one year later. The lease for Fhitting Room’s flagship Flatiron location was signed six months later.
What started as one small studio quickly grew into a remarkable and caring FHITfamily with the most inclusive, supportive community. We hope you’ll join us as we continue this exciting journey. Sign up for a class, and we’ve got you from there!