Yesterday Thor and I played in the snow. Whenever he stopped moving around, I turned and walked away to get him running again. Previously, he would have jumped all over me, but now he just keeps running! How I stopped his persistent jumping: Anytime he approached me I would lean forward (to slow him down) and hold treats at face level. So when he arrived, if he didn't jump, he got treats! Even without treats, he rarely jumps on me anymore. This new skill (not jumping up) works with me but has not transferred to other people yet.
When I fell in the snow (fault of the snow and my ankle, not Thor), Thor came over but did not touch me! He just stood nearby while I struggled to get up. Good boy! (Previously, he would have been on top of me.) When he is full grown, I will teach him to help me balance as I'm rising.