GSP pups learning to sit for attention

I require my pups to sit for attention. In this clip, they are learning "off" as to not jump on me. They only get rewarded when sitting and/or calmn. They are also learning not to mouth/bite me. Mouthing and biting to me is a serious offense and dealt with immediately. Some will get warnings and an oppotunity to make correct choices, some get a flick to the mouth. They learn quickly.