swimming on top of the water

I have a question about swim technique. It applies to all strokes but right now backstroke is my biggest fight. I watched some elite swimmers recently (Ryan Lochte specifically) I noticed he swims more on top of the water rather than in the water. He does this when he is warming up and doing drills as well. I am definitely way lower in the water and I think that is slowing me down. Any body have tips how to achieve this? I asked him, and he said he des not know how he does what he does. He said ask his coach. (David Marsh) He was busy and I did not have a chance.
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