By Nancy Rowe During a visit to the Atlantic coast last summer, I noticed how some people get into the ocean, holding their breath and taking slow, cautious steps, letting the cold water move from ankles to thighs to torso until they’re partially submerged. And then there is the other kind – the kind that runs through the sand, splashes through the surf, and then dives right in. Watching from the shore, I wondered at the difference between these two types of people. I suspect