Kendrick Perkins wants back in the NBA. He is not retired. He is not done. The former Celtics big man has been working feverishly on his conditioning over the past several months and is looking for a training camp invite at age 32. Perkins appeared in good shape when he stopped by the Las Vegas Summer League last week. He played in just 37 games for the Pelicans in 2015-16 before sitting out all of last season after teams showed little interest in his services. Perkins wasn’t pushing as hard for a return last summer, but that doesn’t mean he considers himself retired. He hungers for a return, hoping to contribute as a backup center. “The body feels good, man, I’m just sitting here waiting on an opportunity,” he said. “Hopefully I can get a training camp invite soon. I want to earn my way. I don’t want nobody to give me nothing. So I’ve been working hard, going two or three times a day, working and grinding. I’m just trying to stay with it.” Perkins was a defensive stalwart during the Celtics’ two runs to the NBA Finals. Doc Rivers has always noted that Perkins tearing his ACL during Game 6 of the 2010 Finals completely changed the series. Perkins was traded to Oklahoma City just eight months after the Finals, and he was a serviceable center before being replaced in the lineup by Steven Adams.