A foot slapped the pavement on every drumbeat. Her arms pumped. Oxygen surged. By the time she raced along Broad Canal Walk in Cambridge, endorphins were creating a sense of well-being. In the early 1800s, a canal was dredged from the Charles River into East Cambridge to facilitate industrial shipping. Today, only 1,000 feet of the canal remains below a scenic walkway between the river and Kendall Square.
