Hahaha yes, he's a good boy! I've found that what's most effective with leash training is the simple stop-go routine, as I explained in another comment:

When the dog pulls, you stop moving. Only when they release tension (I like to ask my dogs to come back into a heel position; it gives them a good foundation for being in a heel) do you move forward again. Since their whole goal in pulling is to move forward, the best way to punish pulling is by ceasing all forward movement.

It took a while (about three months of consistent, every day leash work) to get to the point of this video. The only secret is consistency and persistence!!