STAMFORD, Conn. — Whether perched behind the bench clutching a paper cup of black coffee or tutoring 7-year-old skaters in the art of on-ice tag, Martin St. Louis approaches his new role with the same intensity that won him two N.H.L. scoring titles and a Stanley Cup.

More than four months after ending a 16-season N.H.L. career that will almost certainly land him in the Hall of Fame, St. Louis has seamlessly transformed into a full-time father and coach for his sons, Ryan, Lucas and Mason.

St. Louis runs weekday practices, coaches games on weekends and travels with the Mid Fairfield Junior Rangers teams.

“I love hockey; I need it in my life,” he said after four hours of nonstop ice action on a recent Saturday afternoon at the Chelsea Piers complex here. “I want to teach, but more importantly, I want these kids to build good human qualities through sports.”