WALTHAM — Near the end of Celtics practice Thursday, players engaged in a drill designed to sharpen their transition game.
Two players would sprint upcourt and try to score against a defender and then, without skipping a beat, the situation would be repeated going the other way.
The drill was fast-paced and full of sprinting, and coach Brad Stevens kept encouraging his players to push the tempo even more.
When the drill ended, point guard Rajon Rondo was, to quote Stevens, “huffing and puffing,” a sign that Rondo isn’t yet in peak physical condition after sitting out for 11 months.
After the Celtics’ loss Sunday to Indiana, Rondo told reporters his conditioning is his biggest remaining hurdle before he returns to the court. Full story for BostonGlobe.com subscribers.