Celtics

Celtics’ Amir Johnson staying positive and ready to contribute

Amir Johnson (center) lost his starting job in the first round, but he continues to work hard at practice. Matthew J. Lee / Boston Globe

WALTHAM — After the Celtics finished practice on Monday, several players left the facility to go home and rest, and others lingered and played lighthearted shooting games, smiling and laughing and keeping the mood light.

Meanwhile, on a side basket, center Amir Johnson calmly and quietly fired up one jump shot after another, with assistant coach Jay Larranaga leading a small group of staffers rebounding for him.

“If things aren’t working out for you, you know you’ve got to do the next thing,” Johnson said. “If the offense puts you in a position to shoot threes, man, you’d better go ahead and work on your threes, so that’s what I’ve been doing.”

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