Pete Alonso’s legs aren’t only walking, they are talking.

As the Mets slugger stops to consider his April success, which has evoked early comparisons to his record-setting 2019, it’s his lower half receiving the credit.

“He’s been the old Pete coming back,” teammate J.D. Davis said. “I think a big part of it going from 2019 to ’20 and ’21 now, he was really big into his legs, he would get into his legs in ’19 and then in 2020 kind of got away from it.”

Alonso will take a .267/.357/.550 slash line with five homers and 12 RBIs into Tuesday’s game against the Red Sox. His average exit velocity of 98.6 mph leads the major leagues, and his hard-hit ball percentage of 61.9 isn’t far behind.

Simply, he is crushing it.

The latest display came Sunday, when he took Washington’s Patrick Corbin deep, into the black batter’s eye section in center field at Citi Field. The homer was Alonso’s fourth in his last nine games.

“I feel like I am being able to use my legs a little bit more, it’s because I am a little bit more relaxed, and also I am sticking to my game plan and swinging at quality pitches allows me to get in my legs,” Alonso said. “Being in my legs is a product of making quality swing decisions and staying within my zone.

“If I am swinging at balls in the dirt, there is no way I am going to stay in my legs. If I am swinging at balls over my head, there is no way I am going to be able to use my body and put good, quality swings on the ball. So I feel like pitch selection is real huge regarding my success so far early in the year.”

Alonso endured an inconsistent 2020 season after establishing an MLB rookie record with 53 homers a year earlier. He’s on an early pace this season for 48 homers.

The Mets have needed the production, as Francisco Lindor, Michael Conforto and Jeff McNeil — all key members of the lineup — still haven’t gotten on track. Alonso, Davis and Brandon Nimmo have largely carried the offense.

“In ’19 when we all witnessed what [Alonso] did with that record-setting year that we had, he’s that same hitter that we’re seeing,” manager Luis Rojas said. “He’s just quiet, not trying to do too much. I described those first two at-bats [Sunday] when he walked, that’s his approach. He is just quiet and ready for the pitch that he crushes.

“He doesn’t go outside of that. Last year, we would see that he would scatter a little bit with his swing decision. This year, this is the Pete that we know — he looks real comfortable at the plate.”

Alonso doesn’t have an answer as to why the Mets are averaging only 3.29 runs per game, which ranked 28th in the major leagues through Sunday, other than the team’s failure to consistently play because of early postponements.

“Now, we’re getting to a point in the season where there’s going to be more of a constant,” Alonso said. “The constant is going to be better weather and less off days, and I am just ready to attack the meat of this schedule. The start was really tough, and because of the stop-and-go nature of it, it’s been not necessarily a true baseball schedule.

“Whatever we went through, it was tough to get our momentum and have it go continuously, but now I feel like we’re at a critical point where once we get into the meat of the season, I am really excited.”