WHERE NINJAS ARE MADE, AND CHAMPIONS OF LIFE ARE BUILT.————————————————————————————————————

Longmont's award-winning ninja training facility helping kids build confidence, resilience, and character through movement and mentorship.

Young girl swinging across upper body obstacles during youth ninja training at Ark Ninja in Longmont, CO.
Youth athlete tackling overhead obstacle course at Ark Ninja, Longmont's premier ninja gym.
Young girl practicing balance obstacle course during kids ninja training at Ark Ninja in Longmont, CO.

🏆 Voted Longmont's #1 Youth Sports & Recreation Facility
2026 Community Votes Platinum Winner

GET STARTED WITH OUR STARTER PACK ($49) - 4 Classes + 1 Open Gym

UPCOMING EVENTS

Group of children listening to an instructor at an ARK Ninja event.
NINJA CAMPS
Group of children on a winner's podium with medals, celebrating a sports event or competition.
REC / COMPETITIVE TEAMS
Young boy in a gymnasium on a skateboard, holding an exercise ring, smiling and giving a thumbs-up, wearing casual clothes and sneakers.
MINI NINJAS (AGES 2-4)
Children and adults in gym attire watching a coach perform a step-up exercise on boxes during a fitness class in a spacious gym.
BIRTHDAY PARTIES
A woman is mid-air, jumping and holding onto a horizontal bar in an indoor obstacle course or ninja training gym. A man stands nearby watching her on a mat at her feet.
ADULT CLASSES (AGES 13+)
Taylor Greene, professional ninja coach, guiding youth athlete in obstacle technique at Ark Ninja in Longmont, CO.
KIDS CLASSES (AGES 5-12)

FOUNDED ON COMMUNITY

Group of smiling children and adults gathered on a stage for a team event, some wearing matching T-shirts with a logo, with a large banner reading 'Warrior' in the background, and a dog standing in front. 
At ARK Ninja, our community is at the heart of everything we do. We built our business with a deep sense of gratitude and commitment to our people, because without them, we are incomplete. Step into our warm and welcoming community, where your aspirations and achievements are our top priority. At ARK Ninja, we're all about creating a friendly, nurturing environment, believing in the strength of circles to foster personal growth. Our primary goal is to help you discover newfound resilience, vitality, and a profound excitement for life. Come join us on this inviting journey towards personal excellence, and let us be your guide to reaching new heights!