1.For me this looks like a very bad idea, as this is learning the dog to focus on your hips and not at your face as it should, which makes it more difficult to control the movement of the dog...
2.By having this green thing on your left hip, by time you are forcing the dog to walk just a little bit behind you, as the natural position of the dog would be slightly behind you, so the dog can reach the green thing with the nose without any effort, according to rules of obedience, the dogs shoulder should be next your knee !
3.Not everything that looks easy is good, the more you are working with your dog, the more you are bonding and the better relationship you will have in the end
...ofcourse this is only my opinions and I am no expert at all.