LeBron James says he and his Cleveland Cavaliers team-mates have "all got to get into better shape" following Tyronn Lue's appointment as head coach.
Former assistant coach Lue has been promoted to replace David Blatt and saw his first NBA game at the helm finish in a 96-83 defeat to the Chicago Bulls on Saturday.
James, who has rubbished reports he influenced the decision to fire Blatt, is aware the Cavaliers must adapt their style of play to fulfill the demands of their new coach.
"We've played slow basketball up to this point. We walk the ball up a lot, every now and then we get a break and run our turnovers. But the coach wants us to get up the floor and that's a transition from walking the ball up," said James.
"All of us have to do something different as far as our pace and our conditioning because if he [Lue] wants us to play faster and you want to be out on the floor you can't get tired.
"And if you do you've got to come out so it's something that coach Lue wants us to do and we've got to accept it.
"We've all got to get into better shape. The coach wants to play faster so we need to start doing stuff on our off days, doing stuff at practice, doing shoot-arounds, get up and down the floor and get the heart rate going because he wants to play faster and play with more pace than we have done in the past."
James was encouraged by one aspect of Cleveland's performance against the Bulls.
"Defence wasn't our problem, at all," he added. "If I can say that more times... then we'll be pretty good. We'll be ok.
"When you leave a game saying defence was a problem, more often than your offence, then you should start worrying. That wasn't the case."