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Nibiru Jiu-Jitsu
4.8 ★★★★★ 44 Google reviews · BJJ gym in Sun Prairie, Wisconsin
Affiliated academy — reviews and the gym's own info point to a recognized BJJ lineage or affiliation (think Gracie Barra, 10th Planet, Renzo Gracie, Alliance, Atos or Checkmat). If lineage matters to you, ask which affiliation the academy belongs to and under whom the head instructor earned their black belt.
Plan your first class
- Free trial or intro class most gyms welcome new members with a free trial or intro class — check their site or give them a call to book your first session
- Beginner-friendly all levels welcome, including total beginners — you don't need to be fit or have any experience to start
- Kids & youth classes kids and youth BJJ classes — built around discipline, focus, and confidence
- No-gi no-gi grappling classes — training in a rashguard and shorts, with faster scrambles and a natural bridge to MMA
- Competition team a competition team for members who want to test themselves at tournaments
- Today see hours ·
- Website & schedule nibirubjj.com — book classes and see the live schedule
- Phone (608) 886-9390
Hours
| Monday | 9–10 AM, 5:30–8 PM |
| Tuesday | 6–7 AM, 5:30–8 PM |
| Wednesday | 9–10 AM, 5:30–8 PM |
| Thursday | 6–7 AM, 5:30–8 PM |
| Friday | 9–10 AM, 6:30–8 PM |
| Saturday | 9–10 AM |
| Sunday | 10 AM–12 PM |
The classes they run
“With their smooth and steady pace and their step by step tutorials it’s a place id 100% recommend for your kids, and even you!”
“Everyone is welcome - men, women, teens, kids, military, LEO - everyone!”
“Whether you’re looking for a new hobby, or to compete, this is a great place to train and learn.”
“Great gym for having fun, learning self defense and training hard.”
“I started training here as a beginner with absolutely no background in any kind of physical combat sport, and continue to be challenged as I’ve progressed.”
Other martial arts here
“Great gym to learn BJJ and Muay Thai, very knowledgeable and understanding coaches.”
What members say
“Love it brought my grandson here they are very engaged and patient with the kids very knowledgeable coach Bryce”
“I started training here as a beginner with absolutely no background in any kind of physical combat sport, and continue to be challenged as I’ve progressed.”
“The gym culture is extremely positive and welcoming; everyone is there to learn and to help their training partners improve.”
“The instructors are patient and detail-oriented, the cardio is no joke, and the rolling is technical and respectful.”
“The instructors are patient and detail-oriented, the cardio is no joke, and the rolling is technical and respectful.”
“Would recommend if you just want to casually train, lose some weight or go hard for competition.”
From the reviews
This school opened in 2022 and I wish I would have heard of it sooner. My first class had a mix of age groups and people of all sizes. They were very knowledgeable and inviting. I had come with a different martial arts background and love the application of my past training and skills to the new format.
Just started training and Coach Robert and Krysta are amazing. I love the coaching and as a large guy I’m allowed to work at my own pace, but still provides a challenge. I never thought I’d get into Brazilian Ju Jitsu, but Leviathan has me loving my experience.
Robert is the man. I popped in for a day, as I’m here for Madison for work. These guys are very hospitable, and I learned some awesome technique for my toolbox as a brown belt. Many of osses guys!
If you are a student of Brazilian Jiu-Jitsu or you are wanting to give it a try, definitely check out Leviathan BJJ in Sun Prairie. It is located right behind Gus’s Diner on Highway 19.
New to BJJ? Start at Nibiru Jiu-Jitsu
Nibiru Jiu-Jitsu comes up as a beginner-friendly gym, going by their listing and members’ reviews. If you've never rolled or set foot on a mat, that's exactly who a good beginners program is for. A few things worth knowing before your first week. First, you don't need to be fit or flexible to start — you get in shape by training, not before it, and coaches scale the intensity to you. Second, you won't be thrown into hard rolling — reputable gyms build fundamentals (positions, escapes, and basic submissions) for weeks, live rolling eases in gradually, and tapping early keeps every roll safe. Third, all levels really are welcome — ask about a dedicated beginners or fundamentals class time so your first session is alongside others who are also starting out, and leave your ego at the door. Most gyms are happy to let you watch or try a class first, so reach out before you commit.
Your first BJJ class at Nibiru Jiu-Jitsu
Nervous about walking into a BJJ gym for the first time? Almost everyone is, and good coaches expect beginners to come through the door. Here's what to know. What to expect: a typical first class is a warm-up, then drilling basic positions and escapes with a partner — not hard sparring. Rest whenever you need to; no one will bat an eye. What to wear: athletic wear you can move in (or a gi if you have one); you'll train barefoot on the mats. What to bring: water and a mouthguard if you have one — many gyms lend a loaner gi for a first class, so it's worth asking when you call. As you keep training you'll add your own gi (or a rashguard and shorts for no-gi) and a mouthguard. Live rolling eases in gradually, once your fundamentals are solid. Arrive 10–15 minutes early to sign a waiver and meet the coach. It gets easier fast — most people feel far more at home by their third class.
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