F45 Training Flatiron: Group Fitness and HIIT Classes in Flatiron, Manhattan
Group fitness classes in Flatiron
F45 Training Flatiron is at 123 W 20th St, between Sixth and Seventh Avenues on the Chelsea side of Flatiron. The 1 train stops at 18th St a block away, the F and M stop at 23rd St, and Union Square with its 4, 5, 6, L, N, Q, R and W is a ten-minute walk. That puts the studio inside a quick commute from Chelsea, Gramercy, Union Square, NoMad, the West Village and the office towers around Madison Square Park.
Classes are coached 45-minute group workouts that combine strength training, HIIT and functional movement, with a new program every day and a coach correcting form on the floor. Early-morning and post-work slots fill fastest, so most members book their week in advance through the F45 app. It is the group fitness class in Flatiron for people who want structured strength progression without programming their own sessions. Every F45 NYC studio follows the HYROX-aligned program, and one F45 NYC membership also works at Midtown East, Dumbo and Williamsburg, including Sunday HYROX Open Gym at Dumbo, Midtown East and Williamsburg.
Class hours at F45 Flatiron
These are class hours: the first class start and the last class end each day. The studio opens shortly before the first class and closes after the last one. Book ahead in the F45 app, especially for early-morning and post-work slots.
| Monday | to up to 7 classes |
|---|---|
| Tuesday | to up to 7 classes |
| Wednesday | to up to 7 classes |
| Thursday | to up to 6 classes |
| Friday | to up to 7 classes |
| Saturday | to up to 3 classes |
| Sunday | to up to 2 classes |
Taken from the live schedule for 2026-10-06 to 2026-10-19 (the widest window each weekday over two weeks), refreshed daily. Holiday hours can differ; the app always has the current timetable.
The weekly format
Every day is a different coached 45-minute workout. The rotation is the same at every F45 NYC studio, so you can build your week around the days you want.
Resistance training with dumbbells, kettlebells, barbells and sleds.
HIIT intervals built around plyometrics, tempo and conditioning.
Strength and cardio in one session, the format HYROX athletes train most.
Mobility and stretch work to pair with your harder sessions.
Ready to train at F45 Flatiron? Pick a class on the studio schedule. New to F45? Start with the $49 Unlimited Week and try every format.
Book a classWHAT IS F45 TRAINING?
F45 is the world's fastest-growing functional fitness community. Our signature 45-minute workouts combine strength and cardio in an exciting, team-based atmosphere.
Every workout is different. Our coaches guide you through each session, ensuring proper form and pushing you to achieve your best results.
F45 Flatiron FAQs
Where is F45 Flatiron?
F45 Training Flatiron is at 123 W 20th St, New York, NY 10011, between Sixth and Seventh Avenues where Chelsea meets Flatiron. It is a short walk from Union Square and Madison Square Park.
Which subway goes to F45 Flatiron?
Take the 1 to 18th St, one block from the studio, or the F or M to 23rd St. From Union Square (4, 5, 6, L, N, Q, R, W) it is about a ten-minute walk west on 20th St.
Does F45 Flatiron have HYROX Open Gym?
HYROX Open Gym runs on Sundays at F45 Midtown East (1 to 3 PM), F45 Dumbo (12 to 2 PM) and F45 Williamsburg (1 to 3 PM), and Flatiron members can drop into any of them for $20. Every class at Flatiron follows the same HYROX-aligned programming, with sleds, ski erg, rower and wall balls in the weekly rotation.
Is there a free trial at F45 Flatiron?
F45 Flatiron runs a $49 Unlimited Week trial rather than a single free class: seven days of unlimited classes at the studio, booked through the trial link on this page. Arrive ten minutes early for your first class and a coach will walk you through the format.
Can Midtown East members train at F45 Flatiron?
Yes. One F45 NYC membership works at all four F45 NYC studios: Dumbo, Williamsburg, Flatiron and Midtown East. Book through the F45 app or your studio's Mindbody schedule and pick whichever studio is closest that day.
More questions about classes, membership and HYROX? Read the F45 NYC FAQs.
READY TO START?
Join F45 Flatiron today and experience the best functional training in NYC. Start with the $49 Unlimited Week.
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