Bring on the pressure. As in defense.

The first day of Knicks coach Dave Fizdale’s second training camp was focused on a new wrinkle to his game plan — full-court defense.

“We did one-on-one full court (Tuesday),” Fizdale said after their first practice. “Everybody. The bigs, the wings and the guards had to defend each other one-on-one full-court live. Just to get them to understand we have to play defense like that to have a chance to win games.”

Knicks legend Walt Frazier told The Post earlier this month he believed a pressure defense in the backcourt was one way they could go to take advantage of their incredible amount of depth. It requires maximum energy and allows for a deeper rotation. But Fizdale does not want to classify it as a “press.’’

“I don’t know if you want to call it pressing but we’re going to pick up,’’ Fizdale said. “Wayne Ellington declared it this summer that we have to pick up 94 feet. That goes for everybody. If your man’s bringing the ball up, you’ve got to get up there and meet him and have a defensive presence on the ball.

“Some of these guys are so dang fast you don’t want to be up there trying to press them because they’ll go by. But we’ve got to build the habit now if we want to be a top defensive team, we’re going to pick you up.”

Knicks rookie RJ Barrett said Duke played a similar backcourt pressurized defense last season.

“Coach was just telling us he wants us to be a great defensive team,’’ Barrett said. “The only way it’s going to be happen is to keep working at it like we are.”

Fizdale, despite coming out of Pat Riley’s defense-first Heat system, never established a defensive identity for the Knicks during last season’s 17-65 campaign. They finished 29th in defensive rating, allowing 114.6 points per 100 possessions.

The Knicks coach admitted he mixed it up – maybe too much – with schemes.

“We experimented a lot last year,’’ Fizdale said. “We looked at a lot of different stuff, what fits best for our team. We feel like what we’re doing now is the best package for them.”

Fizdale said he also changed the offensive script for an older club that is more ready to handle it.

“We changed a whole lot,’’ Fizdale said. “Now I feel like we’ve got a team that can retain information and execute what you’re trying to do a little bit better. I feel like, again, the versatility that we have I want to do things that utilizes that versatility and maximizes it as much as possible.”