Big changes as Celtics camp begins

Al Horford has officially signed a multi-year deal with the Golden State Warriors, closing out a memorable Boston chapter with a heartfelt farewell. Meanwhile, Jayson Tatum is back on court just four months post-Achilles surgery, stunning fans with promising workout footage.

With ownership adjustments also underway, this training camp feels like a season premiere — except instead of popcorn, fans might need ice packs.