When I made up my mind to seek 10 - 20 people needing to lose at least 40 pounds to run a triathlon with me in July of '07 (6 months from now), my initial concern was "the swim"
From all I had read... the primary intimidation of a triathlon for most folks is the swimming portion. The run only concerned people with bad knees or disabilities and the cycling only concerned people with no bike (or disabilities).
So... I treated my three friends today to "state of the art" swim training. The same training I took (at the recommendation of Bill Bachrach... my "Ironman" friend). The idea of this special training is to "swim like a fish" as effortlessly as possible. It works! After nearly 25 years of not swimming, I was able to swim a kilometer after only one day's training.
My three friends today (two of whom will run the tri with us in July), were amazed at the improvement in their swimming today.