Scott Lapollo runs up to a popular path encircling a reservoir at the edge of Boston and smiles at the sight of hordes of other runners doing laps.

Not long ago he was more likely to spend a cloudless Saturday like this one getting high on something other than sunshine and endorphins, he says. Now he’s working his way through the legal system and fighting his addiction to prescription drugs. Part of his recovery is running with fellow members of the Boston Bulldogs, a running group of men and women who are also contending with substance issues or have family or friends who are.

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