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If you are having trouble with your legs sinking, Total Immersion drills will definitely help. It's all about finding your balance in the water, minimizing drag and unnecessary effort. It teaches you to use the core muscles of the body to initiate your stroke, which tire much less than the smaller arm muscles.
I started swimming in March using the drills from the DVD. I went to a one-day open water clinic with Terry Laughlin yesterday and found it very helpful to have someone to observe doing the techniques and to observe me, as well. They usually videotape you and that can give you a lot of information, too. I still have a lot to work on and the addition of the open water added several other things to work on (sighting, navigating, swimming around other people, not seeing the bottom, not psyching myself out when the offshore buoy looks SO FAR AWAY
Once you feel the effect of the drills and incorporate the techniques into whole-stroke swimming, it becomes much more pleasurable!