Boston promises speed, unity, and big comebacks

The Celtics opened camp at full throttle, with Joe Mazzulla stressing pace and toughness. Jayson Tatum’s Achilles rehab progress lifted spirits, while Payton Pritchard vowed to spark the offense. New faces like Anfernee Simons and Chris Boucher fit in quickly, and Xavier Tillman showed results after shedding 12 pounds.

Boston’s practices are moving so fast, fans might need helmets just to watch — consider it the NBA’s first spectator sport with a speed limit.