How do you train a Bulldog to sit?

Bulldogs are actually smart dogs. In any dogs you can train them to sit by putting your dog's favorite treat over their heads. Your dog will follow the treat and go backwards. When it bumps into a wall, it can't go any further and sits. Then you say 'sit' and give your dog the treat. After doing it for a couple of days, you would say 'sit' and your dog should obey you. P.S: That's how I trained my dog.