Thanks for the tips.
It sounds like I can use this as an alternative to treats. For instance, do an exercise like wait: tell Kaiser to wait (he sits when I tell him wait), put the toy on the ground and then release him from the wait and the reward is that he gets to play chase for a minute or two.
Is a puppy still teething at 8-9 months? If so I'll go easy on the tug-o-war. And I'll back off on the jumping around. However, it's eye opening to see how high he gets.