Mazzulla knows this breakneck practice pace might not be enjoyable for his players, but he’s been pleased with their buy-in thus far. The Celtics returned nearly their entire roster this offseason, so the vast majority of their current players are familiar with Mazzulla’s methods.

The Celtics became the first team in the NBA to kick off training camp officially on Wednesday ahead of their preseason trip to Abu Dhabi next week. Boston had full player participation beyond Kristaps Porzingis for the two hour session at the Auerbach Center which featured some background noise usually heard at games at TD Garden.

A back-to-back pair of scrimmages highlighted the second day of Flyers training camp. Team 1 swept its two games with a 5-2 victory over Team 3 in the first scrimmage, and a 4-3 (1-0) shootout win over Team 2 in the second scrimmage.

Patrick Roy started off his first Islanders training camp with a new trio on the top line and a throwback on the third.