Urban Ninja Project is focused on challenging kids to be active through their obstacle course - healthy competition. It is a non-profit organization striving to encourage healthy lifestyles. To enjoy their obstacle courses, you don't need a membership - it's a drop in fee of $5 and that gets you access to the open gym and a class. They have a full class schedule on the right side of their website. If you live in Lexington, it could be a regular spot for you but if you are visiting, without the need for a membership, it looks like a unique place to build into your itinerary.
They even have birthday party options for open gym, urban ninja obstacle course or nurf wars. And, the rates are really reasonable - check it out here.
They have a video from their website that gives you more of an idea of what they do.
For even more family fun ideas in Lexington, click here to visit LexFun4Kids.com
Photos from the Urban Ninja Facebook page