On Thursday, after practice, he expanded upon those thoughts and clarified himself.
“We don’t work on toughness, we work on smartness,” Rivers said. “We work on being prepared and playing with a force. Listen, the toughness stuff is so overblown. You can’t be tough anyway. I don’t know who is tough anymore. Having said that, we have to be better. I have to prepare them better. They have to come ready. They have to come with the right intentions, the right focus. So, there’s a lot of things we can improve to improve our team.
“It’s a long season to do it. But you can’t wait to do it. You have to do it now.”
“We’re getting mauled on the rebounds every night. So, if I’m another coach, I have to tell my team, ‘Guys, they’re not very physical. they’re not blocking out, they’re not putting bodies on anybody. You can attack this team.’ Until we stop the attack, they’re going to keep doing it.”
Rivers, who played for the Hawks, Knicks and Spurs, made it clear he doesn’t need or want Rajon Rondo  to be an enforcer to show the Celtics are the right kind of tough.
“I don’t know if I want to rally around my 6-foot guard being the enforcer. That’s nice but at the end of the day, if that’s the threat you’re sending, the other team has to feel [good]. Listen, the message should’ve been sent by the scoreboard and the offensive rebounds and all the talking the other team was doing. That should’ve been the message. If that’s got to be the message, then we’ve got real problems.
“I was a leader on some teams, I wasn’t on other teams. I didn’t need anybody to tell me to do things right. At some point, you have to do it yourself.”