Escape from Alcatraz is one of the oldest triathlons in the country—it’s celebrating its forty-fifth anniversary this year—and involves jumping from the _San Francisco Belle_ near Alcatraz Island into the cold waters of San Francisco Bay for a 2.4 km swim, a 29 km hilly bike ride through the Presidio of San Francisco and Golden Gate Park, and a scenic 12.9 km run through national park land. It’s…