The Celtics have a conditioning drill wherein players run a “10” – that is, 10 consecutive lengths up and down the court, also known as five down-and-backs. For centers, a good finishing time is between 1:05 to 1:06; for guards, it’s 1:00 to 1:01.

Bradley completed three straight 10s at sub-minute times — 54 seconds on the first two, 55.8 on the third — with a minute’s rest between each set. However, Bradley was late on his final run; he was supposed to complete it at 55 seconds, not 55.8.

Infuriated, Bradley then ran 10 consecutive 10s (100 total sprints), finishing all of them in less than a minute with about 40 seconds of rest in between each set.

Celtics officials were blown away.