Coach Erik Spoelstra has been disinclined to criticize Chris Bosh publicly for his work on the boards, even though he entered Game 2 with the worst playoff rebounding numbers of his career. But privately, the Heat has been pushing Bosh for more in this area. Bosh responded Sunday night with 10 rebounds, his third-highest total of the postseason, to go along with 12 points. Among 12 centers who have averaged at least 27 minutes per game during the playoffs, Bosh entered Sunday ranked last in rebounding at 6.5 per game after averaging a career-low 6.8 during the regular season. Both numbers are below his 7.9 career playoff average and 8.9 career regular-season average. Also, his 9.7 rebounds per 48 minutes ranked 26th of all 32 centers who have played in the postseason. The good news: He hauled in five boards in the first half of Game 2. Asked Saturday if Bosh’s diminished rebounding concerns the Heat, assistant coach David Fizdale said, “Yes. We’re on him. We’re going to stay on him. We need some big rebounding games out of him. We know that. He knows that. It’s our job to coach, his job to execute it. “And he’s fine with that. He’s so easy to coach. It’s never personal with that. He knows, ‘OK, I’m not getting it done, I’m going to hear it from my coach and I’m OK with that.’ ” Bosh entered Sunday having missed 36 of his past 50 shots from the field. “He’s beating himself up more than we are,” Fizdale said heading into Game 2. “He takes it personally that if he feels he’s not stepping up for his teammates, that drives him crazy.” Fizdale also said when Bosh takes three-pointers, “we would rather it be the corner three. Somehow, he ended up in the slot [late in Game 1] instead of the corner, where we usually see him shoot those shots.” What’s the ideal mix for Bosh as far as how many shots he should take on the perimeter and how many he should take in the paint? “It’s about equal,” Fizdale said. “We need to get him rolling to the rim and catch the ball off the block on his sweet spots, and we also have to take advantage of the fact he can pull bigs away from the hoop and stretch the defense.”