Originally Posted by
Halcyon
Yep, Labs are notorious for being "landsharks" or "furry piranhas." Try reading through the articles I linked to in my previous post and see if you can apply any of them.
I would be very wary of putting her in a "submissive position." What do you mean by that? Is that when you put them on their backs and hold them down? What do you mean she "holds on tight"? Does she grab onto your legs with hers? Oftentimes, jumping can be a sign of excess energy as well as, excitement.