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If your kids love climbing, jumping, swinging, or pretending they’re on American Ninja Warrior, the Milwaukee area has several places where they can train, explore, and burn energy—especially on cold or rainy days.
Here’s a helpful roundup of the best ninja gyms and obstacle-style courses for kids around Milwaukee, including full ninja training studios, birthday party hotspots, indoor adventure parks, and open-gym options for beginners.
💡Looking for more active indoor fun? Check out our guide to the best indoor playgrounds in Milwaukee.
Quick Picks
- Best overall ninja gym: Ultimate Ninjas Oak Creek
- Best curriculum-based training: USA Ninja Challenge Brookfield
- Best ninja team program: Legacy Gym (Wauwatosa & Menomonee Falls)
- Best for mixed-age family fun: Urban Air Waukesha
- Best for large obstacle zones: Air City 360 New Berlin
- Best for trampoline-plus-ninja play: Sky Zone Waukesha & Greenfield
Ultimate Ninjas Oak Creek
400 W Bell Ct #350, Oak Creek, WI 53154
Ultimate Ninjas is a 16,000-square-foot professional ninja gym designed by real American Ninja Warrior athletes. It’s the most complete ninja gym in the Milwaukee area, with options for toddlers through adults.
What families love
- A massive 18.5-foot Mega Wall
- Trampolines, ring slider, monkey bars, warped walls
- 4,000-sq-ft Lil’ Ninjas area for younger kids
- Kids classes, open play, birthday parties, camps
- Elite Team option for competitive ninja athletes
- Friendly and patient coaches (reviewers mention Paola, Maya, and Mike Silenzi often)
Programs offered
- Ninja Classes
- Lil’ Ninjas (ages 3–5)
- Open Play
- Birthday Parties
- Summer & school-break camps
- Competitive Elite Team
This is the best pick for families looking for a true ninja training experience, whether your kids want to play or train more seriously.
USA Ninja Challenge
3225 Gateway Road, Suite 650, Brookfield, WI 53045
USA Ninja Challenge is a curriculum-based ninja training gym focused on skill progression, strength, coordination, balance, and confidence. It’s ideal for families who want structured classes with age-grouped instruction rather than free play.
What families love
- Highly structured program
- Ages 2–17, organized by age
- Experienced youth instructors
- Private birthday parties (up to 24 kids)
- Summer & school-break ninja camps
Programs offered
- Ninja Classes (ages 2–17)
- Ninja Camps
- Private Ninja Birthday Parties
Great option for kids who love repetition, progress charts, and learning “real ninja skills.”
Legacy Gym – Wauwatosa & Menomonee Falls
Wauwatosa: 1535 Underwood Ave, Wauwatosa, WI 53213
Menomonee Falls: N50W13740 Overview Dr, Suite E, Menomonee Falls, WI 53051
Website
Legacy Gym isn’t a full ninja gym, but they offer one of the strongest youth ninja training programs in the region, run by 3-Time American Ninja Warrior competitor Britt Holterman.
Their Legacy Ninja Team includes fall, winter, and spring training seasons for kids who love agility and obstacle challenges.
What families love
- Led by real ANW athletes
- Strong focus on technique, strength, and agility
- Small group sizes
- Friendly, encouraging coaches
- Great for kids who want a team environment
Programs offered
- Legacy Ninja Team (ages vary)
- Ninja Classes
- Kids Fitness Programs
- Birthday Parties
This is an excellent option for kids who want a team-based ninja experience or prefer a structured class environment.
Sky Zone (Waukesha & Greenfield)
Waukesha: W229 N1420 Westwood Dr, Waukesha, WI
Greenfield: 4940 S 76th St, Greenfield, WI
Sky Zone locations offer Ninja Warrior–style obstacle courses alongside their trampoline attractions. It’s not a dedicated ninja gym, but it’s a great option for active kids who love a mix of jumping and challenging ninja elements.
What families love
- Ninja Warrior Course
- Monkey bars, hanging rings, angled platforms
- Trampolines + ninja challenges in one visit
- Good choice for birthday parties
Programs offered
- Open Jump with Ninja Course access
- Birthday Parties
- Glow Nights (depending on location)
This is best for a fun outing or party, especially for kids who want a mix of ninja + trampoline play.
Urban Air Adventure Park (Waukesha)
2440 E Moreland Blvd, Waukesha, WI 53186
Urban Air offers a Warrior Course with uneven platforms, springboards, swinging bags, nets, rings, and balance obstacles. It’s built for ages 5+, with plenty of variations for older kids.
What families love
- Multi-section warrior course
- Encourages strength, speed, agility
- Big challenge for older kids
- Lots of other attractions (trampolines, climbing walls, ball pits)
- Great for team events or parties
Programs offered
- Open Play
- Birthday Parties
- Team-building sessions
- Family play passes
This is a strong pick for kids who want a big obstacle challenge mixed with classic adventure-park attractions.
Air City 360 – New Berlin
5320 S Moorland Rd, New Berlin, WI 53151
Air City 360 is a multi-level adventure and obstacle park with a huge variety of climbing, balancing, and obstacle challenges—perfect for older kids who love more intense activity.
What families love
- 3-Level Ninja Course
- Sky Tower Vertical Climbing Challenge
- Freedom Gaming Obstacle Course
- Air Sports Courts
- Trapeze, soft play, and more
Important notes
- Recommended height: 4’5″+
- Max weight: 220 lbs
Programs offered
- Open Play
- Birthday Parties
- Group events
Tips Before You Go
- Wear athletic clothes
- Pack a water bottle
- Closed-toe shoes required at most ninja gyms
- Check open play times — they vary weekly
- Sign waivers online before arriving (saves time)
- For parties, book 4–6 weeks ahead
FAQs About Ninja Gyms in Milwaukee
What age is best to start ninja training?
Kids as young as 2–3 can start at USA Ninja Challenge or in Lil’ Ninjas at Ultimate Ninjas.
Do ninja gyms host birthday parties?
Yes—every gym on this list offers birthday parties.
Are these gyms good for beginners?
Absolutely. All offer beginner-friendly obstacles and helpful staff.
Do adults participate?
Some gyms (Ultimate Ninjas, Urban Air, Air City 360) offer mixed-age or adult options.
What should kids wear?
Athletic clothes and closed-toe shoes.
More Indoor Play Ideas
- Indoor Playgrounds in Milwaukee
- Birthday Parties for Kids in Milwaukee
- Ultimate Ninjas Oak Creek Review
Calie Herbst, Editor-in-Chief of Milwaukee With Kids, has spent over a decade combining her experiences as a parent of three to create a hub for Milwaukee’s family adventures.
Her decade-long teaching career in Milwaukee Public Schools and academic background, including a Master’s in Teaching from Marquette University and dual B.A.s in Sociology and Spanish from the University of Wisconsin – Madison, fuel her passion for inclusive and engaging family content.
Calie is also a recognized voice in local media, contributing to WISN Channel 12 News, WTMJ Wisconsin Morning News, Fox 6’s Real Milwaukee, and B93.3.
Discover more about Calie’s journey and editorial approach on her About Page and Editorial Policy Page.
