This worked fo me with my Bavarian/Lab cross, once he sat on command, I introduced the raised hand, I continued saying sit and raising my hand until he would do it at various distances, then I stopped saying sit and started with a single whistle "peep" and a raised hand, now a single blast and he sits , when he turns to look at me a confirm the comand with a raised hand. Its also reall important to go to the dog to praise