
Since opening our doors in 2018, Ninja U has been helping people of all ages discover what they’re capable of. From first-time climbers to American Ninja Warrior competitors, we’ve built a place where you can challenge yourself, have fun, and become part of the ninja community.
In 2018, Ninja U became Iowa’s first dedicated obstacle training gym, helping bring the sport of ninja to athletes across the state. What started as one gym has grown into a community of athletes, families, and coaches who love the challenge.
Ninja U was founded by Scott Behrends, creator of Backyard Ninja Kids and a five-time American Ninja Warrior competitor. His passion for ninja competition helped shape Ninja U into a gym where athletes can train for fun, fitness, or the biggest stages in the sport.
Ninja U has become a training ground for some of Iowa’s top ninja athletes. 14+ athletes who have trained at Ninja U have competed on American Ninja Warrior, including Levi Enright, Ben Behrends, Chris Behrends, Jason Behrends, Jackson Twait, Drew Nester, Isaiah Barney, Nate Person, and many more.
Think you could be next? We do too.
Ninja U started in Cedar Falls, our original location, and has since expanded to a second gym in Ankeny. Wherever you train, you’ll find the same goal: get better, have fun, and push yourself.
Unlike any other gym in America, you don’t have to be enrolled in a class to experience Ninja U. Our open gym is available daily, giving you the freedom to practice your favorite obstacles, try something new, or simply come play.
Whether you live nearby or you’re just passing through Iowa, come climb, swing, jump, and see what you can do.
Ninja isn’t just for elite athletes. Our programs are designed to help everyone progress at their own pace, from their very first obstacle to competitive training.
Our main programs include:
We offer many other classes, to help make ninja accessible to athletes with all ages and still levels!
Ninja U isn’t just a place to train—we’re also a place to compete. We proudly host ninja competitions and events that bring athletes from across Iowa and beyond together to test their skills.
Ninja U is where people come to move, play, celebrate, and make memories. From birthday parties and field trips to group events and open gym sessions, there’s always something to climb, swing from, or conquer.
At the heart of Ninja U is our community. We cheer for the first-time kid who finally makes it across an obstacle just as loudly as we cheer for the athlete chasing a podium.
No matter your age or experience level, you’ll find coaches and athletes who want to see you succeed.
With a 4.9-star rating from 149 reviews, families and athletes consistently recognize Ninja U for its top-tier facilities, coaching, and overall experience.
Whether you’re looking for a new activity, a place to train, a competitive team, or just somewhere to have a ton of fun, Ninja U is ready for you.
Come try a class. Come to open gym. Come challenge yourself.
Your next obstacle starts here.

At Ninja U, we inspire people of all ages to challenge themselves, grow stronger, and believe in their potential. Whether you’re a first-time visitor or a dedicated ninja, we want you to leave thinking about the obstacles you conquered, the fun you had, and the goals you’ll reach next. With open gym every day, top-tier training, and a welcoming “Iowa Nice” community, Ninja U is where fun meets determination, and every visit leaves you wanting more.


Owner & Ninja U Coach, American Ninja Warrior Season 11 (2019) Vegas Finalist, Season 14 (2022), Season 15 (2023) Vegas Finalist, Season 16 (2024) & Season 18 (2026). Started Backyard Ninja Kids with his 3 kids.

Ninja U Cedar Falls Coach, American Ninja Warrior Season 13 (2021), 14 (2022) Vegas Finalist ($10k Mega Wall Winner), & Season 16 (2024) Vegas Finalist. We call him the Brofesser.

Ninja U Cedar Falls Coach, (Scott’s son), American Ninja Warrior Season 14 (2022), Season 15 (2023) Vegas Finalist, Season 16 (2024) Vegas Finalist, Season 17 (2025) Finalist, Season 18 (2026), & American Ninja Warrior Jr Season 1 (2018). His ninja name is “The Hype Guy”.

Ninja U Cedar Falls Coach, (Scott’s son), American Ninja Warrior Season 18 (2026), Season 17 (2025) Finalist, & American Ninja Warrior Jr Season 1 (2018). Made history as the shortest ninja ever to get a buzzer at just 4’11”. His ninja name is “Biggie Smalls”.

Ninja U Ankeny Coach, American Ninja Warrior Season 14 (2022) Vegas Finalist, & Season 16 (2024). He’s the “Ninja Medic”.

Ninja U Ankeny Coach, American Ninja Warrior Season 15 (2023). Watch out for “Ninja Person”.

Former Ninja U Cedar Falls Coach, (Scott’s nephew), American Ninja Warrior Season 13 (2021), 14 (2022) Vegas Finalist (Fastest time in Qualifier!), & Season 16 (2024) Vegas Finalist.

Former Ninja U Cedar Falls Coach, American Ninja Warrior Season 12 (2020) & 14 (2022). Now coaches in Arizona!

Trains at Ninja U Cedar Falls, “The Cat Daddy” from Hudson, IA, American Ninja Warrior Season 11 (2019), Season 12 (2020), Season 13 (2021), Mega Wall Winner, Season 14 (2022) Vegas Finalist, Season 15 (2023) Vegas Finalist, & Season 16 (2024) Vegas Finalist.

Trains at Ninja U Cedar Falls, lives in Cedar Rapids, Iowa, American Ninja Warrior Season 17 (2025) & Season 18 (2026).

Trains at Ninja U Cedar Falls, from Marion, IA, American Ninja Warrior Season 14 (2022) & Season 16 (2024). He is the “Etch-a-Sketch Ninja”.

Trains at Ninja U Cedar Falls, American Ninja Warrior Season 13 (2021) & Season 17 (2025). His ninja name is “The Rugby Ninja”.

American Ninja Warrior Season 14 (2022), Has been training at Ninja U since the day the Ninja U Cedar Falls opened, UNI student

Former Ninja U Cedar Falls Coach, American Ninja Warrior Season 14 (2022), from Minnesota & also works at Conquer Ninja Gyms

Former Ninja U Cedar Falls Coach, American Ninja Warrior Jr Season 2 (2019)
Start training with us and we can help you become the next
American Ninja Warrior!


(pronounced like Paul-eye)

Jacob is a dad to 4 kids (Wil, Julian, Violet, & Olive), a husband to Nikki, and pretty much a jack of all trades. The most impressive part is that he is the most decorated pole vaulter in the history of UNI’s track & field program. He earned a total of six All-American citations over his career, and in 2001 he captured the NCAA Indoor national title in the event. Jacob claimed six Missouri Valley Conference championships in the pole vault, earning him a spot on the MVC All-Centennial Team.
Following his successful career at UNI, he made an impact on the national scene, finishing fifth at the 2008 Olympic Trials and being selected as an alternate for the United States team at the 2008 Olympics in Beijing, China. As a member of the 2007 USA World Team, Jacob finished third at the outdoor USA Championships and fifth at the indoor USA Championships.
He also holds two Drake Relays crowns – one as a collegiate athlete and one as a professional. He still holds the indoor (18-07.75) and outdoor (18-06.50) school records in the pole vault. So yah, he was really good. And he’ll be just the coach to know how to push you to be your best at Ninja U.
(pronounced like Bear-renz)

Scott has lived in Cedar Falls since he was 5 years old and probably will never leave. He married his high school sweetheart and has 3 kids. He attended UNI and studied Personal Training, but then changed his major to Computer Science. He keeps up with all things tech and has worked in IT since graduating.
Scott fell in love with ninja when he first saw American Ninja Warrior. It was the sport he always wished he had as a kid because #climber. (If you are a parent, you might know this type!) In 2016, his sons kept making obstacle courses in the backyard & timing themselves. Scott recorded them & uploaded one to YouTube. “Backyard Ninja Kids” was born, and it now has over 10,000 YouTube subscribers & over 14,000 Instagram followers. Scott and his sons (Ben & Jason), daughter (Lia), and wife (Lindsey) have enjoyed being part of the ninja community. Scott competed on 5 Seasons of American Ninja Warrior. In Season 11, he hit the buzzer in Tacoma City Qualifiers & moved onto Tacoma City Finals, where he placed 9th which qualified him to compete at the American Ninja Warrior Finals in Las Vegas. (Season 11: Episodes 4, 10, & 14). In Seasons 14, 15, & 16, he competed with his oldest son, Ben. He & Ben became the 1st Father/Son Duo to ever make it to Vegas Finals. His sons, Ben & Jason, also competed on American Ninja Warrior Junior Season 1, along with season 17 of American Ninja Warrior, making it to the top 16, and top 32 respectively. You find find them on episodes 14, 16, & 17 (and many more…)

