I have a Specialized Crosstrail. They state that it's a single track capable hybrid. Now, I've never done a park with jumps and all like you are stating. But I've taken it on some mountain bike trails around my place that I would never ride a comfort style bike on. And it did just fine. The frame has mtb geometry. The difference is the 700c x 45 wheels/tires on the thing. And that's still smaller than a 29'er. So I feel totally comfortable taking this thing on a mtb trail. With more aggressive tires, no problem at all, and no need for a mtb specific bike.