Orangetheory Fitness

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4243 E 136th Ave
Thornton, CO 80602
Orangetheory Fitness in Thornton, CO offers heart rate zone training that delivers a smarter way to work out. Experience an expertly designed, full-body group workout combining cardio and strength training with real-time tracking for measurable results you can see and feel. Here in Thornton, your heart rate sets the pace, enabling our triple-certified coaches to get you into the optimal zone. The result is a personalized fitness experience tailored to your fitness level.

Reviews

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5.022 reviews
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Meghan D.
12/31/2025

O have never been to a group fitness class like this before, and I have always been way too intimidated to give it a shot... until now. I'm trying to find a style of training that would fit my...

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Bailey D.
10/19/2022

One of the best things about having an Orangetheory membership is that you don't have to worry about missing a class just because you're traveling! My fiancé and I were in the Denver-area...

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Julia F.
8/3/2023

My favorite gym I've ever been a part of. Classes are fast paced and everything is explained well, coaches are super supportive, and accomodations/personalization of workouts is supplied as...

Sophia P.
6/24/2023

amazing atmosphere, excellent coaches, terrific classes. Worth EVERY penny! And you'll make instant friends

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Daniel G.
6/15/2019

This was our first workout at Orangetheory! We are from Cheyenne, Wy and wanted to stop by for a workout since we were near the area. We were met with awesome front desk people and from the time...

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