Well, I think it's always good to squirm and kick without kicking too hard, depending on the pred. Some preds want you to slam as hard as you can, but a lot want you just to move around inside so they can feel how lively you are. Internal massages are also good, really working your hands into the stomach walls and rubbing up and down and around. Pred like the feel of that and love seeing the imprints push out on a round belly.