I visited TreeUmph with friends and teenagers and it was the most physically challenging thing I have done in a while. It was tough, but so much fun at the same time. While they have a course for younger ones (under 12), my personal opinion is that if you want to do the course too, then leave them home for another day. It is certainly fun for all.
While there are guides stationed throughout, they are not there to baby you and walk you through every step. You manage yourself through the course which is great. They will come help and "rescue" you if needed, but beware as that means you are done and cannot continue on with the course with the exception of the zipline at the end.