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    9ROUND

    2.6 (5 reviews)
    Closed 6:00 am - 11:00 AM, 3:30 pm - 6:00 PM

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    8 years ago

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    Delanie R.

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    7 years ago

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    7 years ago

    Rude, inexperienced "trainers". Horrible hours. Scam of a contract that they con you into.

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    Peak Kickboxing - Peak Kickboxing Northglenn studio exterior.

    Peak Kickboxing

    4.2(28 reviews)
    2.5 mi

    Completed the 6 week. Holy cow was it fun and hard. Sara was amazing coach and glad she helped me…read moreout. She is so sweet and a crazy badass kickboxer. Had a couple mental issues with the food but got there. And every time I freaked out, Sara was so sweet that she helped me get back on track. Takes a lot of commitment. The kickboxing was fun and made you excited for the next class. The food was my toughest challenge. I'm not sure how I did it, but I succeeded My body is almost where I want it, so with all the new things I learned I'm very confident I'm gonna get there. Kickboxing is such a cool skill to lean. I feel mentally and physically stronger. I also learn self discipline and new healthy habits. My new goal is now is keep this going. I highly recommend this place. Yes, this messed with my mental state a couple of times but now happier in general. I feel much more confident and excited to workout. I feel so much better about my body. Plus, my posture is better and I'm walking tall. So if you are someone who wants to get back into working out and but don't know how to get there. This place is perfect to help you there. The coaches are all amazing and will assist you in achieving your goals

    Love it here!! Awesome staff and coaches! They make the community so welcoming and motivating!!The…read moreclasses are amazing! I always leave sweating and smiling! This gym I my new home!! Saved my life! I will continue to come back and workout here!! 100/ 10 recommend!

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    Peak Kickboxing - Our awesome Northglenn staff!

    Our awesome Northglenn staff!

    Peak Kickboxing - One of our members crushed 800 classes!

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    One of our members crushed 800 classes!

    Fit Theorem

    Fit Theorem

    3.7(3 reviews)
    2.5 mi

    Let me save you the hassle for their pitches. It's $140 a month for a kick boxing club, with $197…read morestart up fee and you have to pay first and last month of an annual fee for $447. They advertise a "free" six weeks - actually you pay $599.95 if you don't crash diet and lose 25 lbs or 6% of body fat according to their unscientific machine at the end of those six weeks. Most doctors tell you that you don't want to lose more than 1-2lbs a week, so the max they should recommend is 12 lbs. I am a weight lifter and I expect to gain weight and instead go through body recomposition, but I doubt whatever they have actually measures body fat. I went in for a consult expecting to work out and have a form review, but first they sat me down and did their pitch. I thought this was to try out kickboxing for free to see if I like it. Nope, they're monetizing crash dieting. Stay away.

    The Six Week Challenge at Fit Theorem Northglenn was the best way to jumpstart my weight loss…read morejourney and ongoing healthy lifestyle. I am someone who has historically hated working out--but the 45-minute kickboxing HIIT classes at Fit Theorem are structured in a way that makes workouts go by quickly and incorporate an invigorating amount of energy and fun into each class. The coaches bring such a positive attitude and it is very evident that they are deeply passionate about the classes beyond their paychecks. Another element that I really loved about the classes was that every participant can go at their own paces to keep their heart rates wherever is necessary for individualized goals. The nutrition plan was straightforward with ample choices of proteins, vegetables, and carbs. It was easy to follow for even the busiest of lifestyles. The class times offered from 5:15 am-7:45 pm are very accommodating to different work/school schedules. I would recommend this challenge to anyone that is tired of making excuses and looking for accountability towards healthy goals.

    9ROUND - gyms - Updated May 2026

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