First I put my longest check cord on Pritch and went to a field with a fence. I looped the cord around a fence post and then backed off (the end of the check cord was still in my hand) until I the dog was at my feet. When I blew the whistle she sat down, and I gave her a treat. Next, I moved farther back from Pritch (lengthening my end of the cord, which shortened the dog's end) while keeping tension on the leash. I blew the whistle and with no way to run to me Pritch eventually sat. Since I was now at a distance, I just lobbed a treat in her general direction and allowed her to enjoy it. Again I moved farther back and blew the whistle and she sat. After working on this we moved to other drills and started again the following day. After a few days Pritch had it figured out. She knew that one short blast meant to put her fanny down wherever she was in the field.