The Unique Tool Pete Alonso Uses in the On-Deck Circle – Not a Bat, Not a Ball

If you’ve been watching the New York Mets this season, you’ve probably spotted an unusual scene before each of Pete Alonso‘s at-bats: the slugger in the on-deck circle swinging an 8-pound sledgehammer like it’s a bat. It’s not a prop. It’s not a gimmick. And it’s not a superstition. According to Alonso, it’s a serious part of his hitting routine — inspired by none other than MLB’s controversial home run king, Barry Bonds.

“I started swinging and hitting front toss and balls off the tee with it in the offseason,” Alonso told Newsday’s Roger Rubin. “I use it as a tool just to make sure everything’s sequencing correctly in my swing.”

From Barry Bonds to Pete Alonso: The Sledgehammer Connection

The use of a sledgehammer as a training tool isn’t entirely new. According to Alonso, he learned that Barry Bonds — widely regarded as one of the greatest hitters in baseball history — used a sledgehammer to warm up during his time with the Pittsburgh Pirates. That revelation stuck with Alonso, who saw value in taking unconventional measures to maintain and refine his swing mechanics.

The 8-pound sledgehammer isn’t just for show. Alonso uses it in live settings, working off the tee and during soft toss sessions. The tool helps him stay connected, ensuring his hips, hands, and barrel move in perfect harmony — the kind of sequencing elite hitters obsess over.

“Think about it like an artist who has many different kinds of brushes,” Alonso explained. “They have their tools. We have ours.”

A Unique Hitter’s Toolbox

Alonso’s analogy hits home for many hitters across the league. In a sport as nuanced as baseball, every hitter has a different feel, different rhythm, and different tools that help unlock their best performance.

“We have like a trillion different things: heavy bats, different grips, weights, sizes. They are all tools,” Alonso said. “You get the tool you’re most comfortable with and think you can use to produce your best work. For me, it’s an eight-pound sledgehammer.”

It may seem bizarre to casual fans — a power hitter mimicking hacks with a piece of hardware more suited for construction work than a baseball diamond. But for Alonso, it’s just another part of a carefully crafted approach to hitting that has made him one of the most productive offensive players on the Mets this season.

Alonso’s Strong 2025 Campaign So Far

Despite dealing with a right-hand contusion, Alonso entered the weekend as the team’s most valuable hitter by nearly every statistical measure. According to ESPN:

• Batting average: .272 (leads qualified Mets players)

• OPS: .885 (team leader)

• RBIs: 80 (team leader)

• Doubles: 26 (team leader)

• Home runs: 22 (second on the team)

Alonso’s power hasn’t disappeared, and his contact numbers are up. It’s clear that the off-field adjustments, like integrating new tools into his training — even something as unconventional as a sledgehammer — are paying off.

He’s not alone, either. Brandon Nimmo, another Mets starter, has also been spotted wielding the sledgehammer in the on-deck circle. His slash line heading into Friday was a solid .264/.330/.467 with 19 home runs and 57 RBIs in 99 games.

Together, Alonso and Nimmo are helping to anchor a Mets lineup that is fighting for control of the National League East.

Mets Back on Top in NL East

As of Thursday, the Mets (59-44) held a half-game lead over the Philadelphia Phillies (58-44) in a tightly contested division race. With postseason dreams in full swing and momentum starting to build, perhaps Alonso’s sledgehammer can serve as a new good-luck charm — much like last season’s “OMG” dugout sign that became a quirky rally symbol for the team.

Whether or not the sledgehammer holds any magical powers, it’s clear that it’s symbolic of something deeper: Alonso’s commitment to improvement, innovation, and consistency at the plate.

It’s Not “Magic Fairy Dust” — But It Works

Of course, Alonso doesn’t believe in quick fixes.

“The sledgehammer isn’t magic fairy dust that will cure everything,” he said.

He knows that hitting is a grind. No tool, no matter how heavy or historic, can solve slumps or guarantee results. But what it can do — and clearly has done — is keep Alonso’s mechanics in tune and his mindset sharp.

In the mental chess match that is Major League Baseball, small advantages matter. Even if those advantages come from an 8-pound hammer that looks like it belongs in a garage more than a dugout.

A Symbol of Innovation in Baseball’s Changing Landscape

Alonso’s embrace of the sledgehammer also highlights a larger trend in modern baseball: players using science, experimentation, and personalized routines to gain an edge. Whether it’s advanced data analytics, wearable tech, or creative strength training, players are exploring everything they can to stay sharp in the grind of a 162-game season.

The traditional bat weight? That’s old news.

Alonso and Nimmo swinging construction-grade sledgehammers? That’s 2025 baseball — weird, fascinating, and effective.

Final Thoughts: Will the Sledgehammer Be Part of Mets Lore?

Whether or not the Mets make a deep postseason run this year, it’s clear that Pete Alonso has already delivered one of the season’s most iconic visuals: a home run threat calmly swinging a sledgehammer before stepping into the box.

It’s a reminder that greatness often comes from unexpected places — and that sometimes, to stay sharp, you have to think like an artist with a new brush.

If this ends with a division title or a deep playoff run, don’t be surprised if Alonso’s sledgehammer becomes the new rally symbol for a Mets fanbase craving glory.

After all, in a game built on tradition, sometimes it takes a hammer to build something new.