Jack McDonald

🧵 I've been at Driveline for almost 3 months and I've learned more about player development than I ever thought possible If you're a college/high school coach wanting to turn your hitters into ANIMALS, this thread is for you 👇

Posture work w/ @francobarbz He needs LESS forward bend during his load & stride Too much leads to him losing posture - pulling the barrel flat & across By staying taller, he can replace forward bend w side bend — or even add a bit if needed — and maintain a more vertical path

4 hitters who were below average by wRC+ in 2025 but have underlying numbers that say the results are coming Sometimes the numbers on the surface don't tell the whole story. Here are the guys I'm buying stock in for 2026 A thread 🧵

Man vs machine 🤖 Luke Hilton comes out on top with 105.8 EV 👏

After being DFA’d by the Mariners last year, Rowdy came in to the gym to stay ready for any opportunity A few weeks of work and some tweaks later, Rowdy was able to be a solid contributor to a struggling Rangers offense: .259/.315/.457 good for a 124 OPS+ Someone sign this man

Dylan Carey has been on a tear to kick off his senior season 🔥 Swipe for the highlights and a look at his offseason development!

Leather Smash Ball RH Slider out of the iPitch🤮 It's a real pitch, but no one in MLB is even close Seeing some of the pitch data I'm not sure how our hitters hit anything at all🤯 If your practice is still easier than the game, you might need to do something new...

Bat speed is trainable. How we apply it to the game is incredibly important.

E2 » 🔵🟡 6, 🌲 4 @LukeLavin3 double @ethanhott_ two-run 💣 The Card punches back 👊 📺 » ACC Network Extra | #GoStanford

Incorporating Training Bats into game speed training is a great way to help transfer gains from drill work to competitive pitch speeds They can also be used to increase the difficulty & really target a specific adaptation within the context of game speed pitches 🧵w/ examples:

Spring is peak Tommy John season and workload data explains why. More UCL injuries happen in spring training and early spring than any other time of year at every level. It isn’t bad luck. The data tells us exactly why it keeps happening and how to monitor it. 🧵

FA @Maka18R has been one of the best workers in the building this offseason. Bat speed up, exit velo up, and excelling in Live ABs every week. Slashed .311/.410/.511 in the USPBL last year - the production is there.

Main focus for @_MasonHughes11 when he came in this winter was to create a flatter path w/ better (more oppo) direction in order to: • Cover the top of the zone • Increase ability to drive balls oppo • Improve ball-flight (less top-spin) pull-side Currently: .414/.500/.586

You have the numbers. Now get the plan. Introducing the Driveline Roadmap. Baseball's most complete player development system. Your data, connected. Your goals, within reach. Every step mapped out. All you have to do is show up. Know where you've been. Know where you are. Know where you're going. Coming soon to Driveline Baseball. Stay in the know → drivelinebaseball.com/training/

As the pro offseason ends, the focus shifts from major adaptations to transferring gains to the game To help w/ this, we're mixing in longer distance & higher velo environments for drill work Pro group doing their drills vs iPitch at 47' throwing 77-80mph w/ Leather Smash Balls

Tristan Peters CRUSHED that baseball 💥

How bout this to end the offseason for @BrandonCompton_ 910 ft of homers in 2 swings to the 🌕

Things you love to see: 👇

The way to end the pro offseason: Get on the pro smashball leaderboard! 🚀@Sean_McLain_

"That was f@#%!& sick!" 🤯 432 FEET—A new Trajekt distance PR for the #1 overall pick. Check out Travis Bazzana working @Tstokey in the cage. Sometimes one simple cue can make all the difference 🚀

Here is why bat speed matters. @dylancarey08 with 81.5 mph of in game bat speed and he didn't get all of this ball! Check the replies for his bat speed when he came in for his assessment this summer.