He looked slightly off at the trot in the lunge video to me, maybe I'm seeing things. You may want to take a closer look regardless.

Anyways, on to the riding video. Your main problem here is that your horse is quite on the forehand. He is stuck there, which is why his gait isn't quite free and his neck and head are heavy. You can easily look up exercises for horses that are heavy on the fore, but a good way to start is to yield out of the circle to take weight off the inside shoulder. Leg yielding also helps, as well as turns on the haunches. The other part of this is the weakness of the hind, it is not active. To activate it, you will need more forward and a lightening of the forehand (the forehand exercises often help the hind). See how his hind starts to bend and activate when you go over the poles? Try aiming for that all the time. You may not literally get there but it is a good image to keep in mind. His lower neck is supporting quite a bit of weight due to his fore heaviness, you want him to carry his head with his upper neck and relax the lower. 

Onto position.  The camera isn't close up but it looks like you have puppy paws, which can contribute to front end heaviness.  Rotate your hand and open your elbow, allow it to move smoothly with his movement.  Deepen into your heels and softly open your chest, you look a bit perchy at some points.  Make sure to keep your shoulders loose as well.  They don't need to move around a whole lot, but at the moment they are stiff and disrupt the fluidity of your arm.  Also, I don't think you need to flex his head in during the canter, it leads him onto his inside shoulder and makes his movement more awkward as well as gets him stuck in his left neck.

I'm feeling lazy tonight so I'll leave it at that level of vagueness. If you have any questions, ask me.  

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Last Edited By: Mar 16 11 6:20 PM. Edited 5 times.