The first thing I do is get the dog to take the dumbell from my hand. I don't want it to be a prey item. similar to clicker training except I mark with a "good" (marker) instead of the click.
initially, when the dog even glances at the dumbell. he gets a "good" and a treat. That progresses to a nose touch, "good" and treat. It doesn't take long before the dog mouths the dumbell, "good" and a treat.
When they first grip it, it will only be for a split second. I don't add the out till the dog is holding for a second or two. When that is solid, just start moving the dumbell in different positions. Out to the side, straight out, etc. give the dog different pictures. Then you can move your hand to the ground. The first time you set the dumbell on the gorund without touching it, many dogs will totally wonder what the heck are you doing. Just be patient.
Thunder took all of about 20 mins to learn this, and that was overcomming the fact that he had learned to to do a down and bark alert on cadaver scent this way. He just stood there barking at the dumbell for the first 4-5 mins. Then he realized that wasn't working this time and he tarted expierimenting with a paw tap, a sit, down, etc. He now knows when I want a new behavior. It's just a matter of him hitting on the right combo.
I never teach the retrieve with the jump. They are two separate exercises. When both are solid, everything will fall together.
Someone put a clicker video on our video form. It was teaching a dog to close a drawer with clicker only. this is the same principal. Reward correct response, ignore wrong response.
My first training scenario every day is a competition level retrieve. Thunder looks forward to it because he knows it's the start of FUN training.
I'm not going to knock forced retrieve because I did it succesfully for years. I've just found that a dog willing to retrieve on command, with a great attitude, is a lot more fun to watch then a dog who is doing it "just cause I said so"! When the forced retrieve is done by the right person and the right dog, the dogs level will come back. I've just seen to many "correct" retrieves where the dog wasn't as enthusiastic as I like to see.