Librarian starts every day with dip in the bay

Jeff Gunderson, 55, of Greenbrae commutes to San Francisco where he works as a librarian and swims in the bay before work, after work or at lunch.

Why: Bay swimming is particularly exhilarating – experiencing all of the elements: the cold (which can dip to the upper 40s in the winter), the ebb and flood tides, the wind, the swell, boats, debris and creatures.