In order to get ready for a competitive swim around Alcatraz Island in the middle of San Francisco Bay, Citrus County sheriff's Deputy Kurt Lynn works out in the Whispering Pines Park swimming pool last week when the water temperature was 58 degrees. "I'm going to try to get in once a week before they turn the heater on (in March) just to get used to (the cold). If I don't, I'll have to sit in a bathtub full of ice, and this is much easier," he said. The deputy said the water temperature around Alcatraz Island, the former maximum-security federal prison that is now a popular tourist attraction, is typically in the upper 50s. Lynn said that he is planning to use his participation in the July event as a fundraiser for the American Heart Association and the American Diabetes Association. The pool's temperature was unusually cold due to consecutive nights of subfreezing temperatures last week. Lynn was also doing double duty by taking leaves and other debris from the pool's bottom.