Flip Side Ninja Park is an indoor ninja-warrior obstacle gym in Lowell that runs week-long summer camps where kids learn ninja skills and tackle obstacle courses. Camps run Monday-Friday, 10:30am-12:30pm (half-day), across weeks in June and July. Camper ages are not specified on the site.
The practical details
We list only what the camp itself publishes, and programs change — dates, prices, ages and availability can all move after we check. Confirm the details on the camp’s own website and contact Flip Side Ninja Park directly before you register or pay. Last checked August 2026.
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★★★★★Whitney PattonMy 5 yr old joined in January, after hearing about ninja from friends and attending a birthday party here, and has absolutely loved it! All of the coaches are so helpful and encouraging. Last night, he had a new coach and I wasnt sure how he would do with someone new, but he told me that coach Mason was so kind and helpful. They interact with the kids in such fun ways while also giving them opportunities to learn and grow!
★★TheWarDog3Great place my kids love it…But I feel some of the coaches are excited and encouraging and the others seem like they don’t want to be here and are not engaging little to not at all…. I see the children cheering and encouraging each other more than the coaches. We will continue to go and I hope this can help management to encourage the coaches to be more excited and encouraging to the children so I can give a 5 star review. Looking forward to changes👍
★★★★★Bentley KirklandWe had a birthday party here and it was a great experience! We scheduled the after hours private party and it was perfect for our 8 year old and his friends. The facility was clean and super fun. Those working at Flip Side were very helpful and interacted well with the kids. We brought the food and drinks. The decorations and paper goods were provided and already set up when we got there. We would definitely do it again. We haven't been to an open gym, but definitely will go at some point. My 8 and 5 year old have asked several times to go back!
★★★★★Preston HumbardWe attended an open gym session and my son loved it. He didn't stop trying the many different obstacles and of course the wall for the entire hour. Staff were friendly and very helpful with all the kids. If we lived closer we'd definitely have him attend regular classes. Can't recommend this place enough.
★★★★★Scott SchroenThis place is awesome. We brought our six and eight year old kids and the coaches were all so good to them. Throughout the open time they would rearrange things to make new obstacles which kept it interesting. Though even our youngest, aged six, had a blast the features were well suited for adults. Everything was well built and thought out. Five star all the way.