NBA players usually have their pregame warm-ups which includes stretching, sprints, a few laps, and more to loosen up the muscles and get warm before tip-off.
Usually coaches don’t get loose before games, but the Clippers’ Doc Rivers needed to get his neck warmed up as well and went to town on the bench as he did some interesting stretching with his neck while making some odd-looking faces.
Hey you look like you are in pain Doc. I recommend a chiropractor for those stubborn neck pains.