Hitting Trainer @DrivelineBB | Exploring how hitters learn, adapt, and improve.
Tampa, FL
Joined October 2026
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Following up on how pitch location influences pelvis and torso rotation, I wanted to explore what the bat was doing.
I was surprised to see a lower average attack angle up and in than down and away. That made me want to dig further into the outcomes behind those averages.
The ball-flight plot adds context too.
Average launch angle was actually higher for outs than HRs: 32.5° vs. 29.7°.
But outs combines very different balls in play. Seeing the spread alongside exit velocity tells us more than either average alone.
Bay Liskey retweeted
- @DrivelineBB is coming to the Dominican Republic. 🇩🇴⚾
On Nov. 16, its first Caribbean facility opens in Guerra, bringing U.S.-level pitching and hitting assessments to local players, with biomechanics reports in Spanish.
drivelinedr.com
Bay Liskey retweeted
Jacob Young is in agreement with the Nationals on a 4-yr extension with an option year. Guarantee is $23M @ByRobertMurray 1st that there was an agreement
Bay Liskey retweeted
Jackson Holliday was once a top prospect in baseball.
Up to this point in time he hasn't lived up to expectations with a career .299 xwOBA & a .654 OPS.
Why? I believe there are 3 potential contributing factors.
🧵⬇️⬇️
Bay Liskey retweeted
This is a major piece to staying on plane
If the barrel turns on a consistent path (holding your line), the hitter can match that plane w/ the incoming pitch
Pulling the bat off this plane also pulls it off the path of the pitch, reducing margin for error
🧵with details
VBA & Swing Path Tilt ➡️ not the same metric.
LHH⬇️= Steep Tilt w/ flat VBA @ contact
RHH⬇️= Steep Tilt & holds line through contact
Tilt is the plane the barrel moves through 40 MS before contact while VBA is the barrel's angle measured @ contact.
Discrepancies between the two often lead to poor connection @ impact & could be a result of a hitter making last minute compensations in their swing to try & achieve flush contact.
A conversation with @kozy_shack yesterday got me curious about how pelvis and torso rotation at contact vary across pitch locations.
I looked at our @DrivelineBB mocap data from 42 right-handed MLB/MiLB hitters.
The findings were intuitive, but useful to see laid out. 👇
All of this makes a lot of sense.
Up and in generally calls for contact farther out front, and in our data we see more torso rotation.
Down and away is typically met deeper, before the torso has turned as far.
Bay Liskey retweeted
Behind in the count, Snell has to come in.
Pitch 4: changeup in the zone, foul.
Pitch 5: slider in the zone, foul.
Pitch 6: curveball in the zone, foul.
Three in-zone pitches, three different looks, three competitive swings.
Bay Liskey retweeted
The whole at-bat in one picture.
In the zone: 7 pitches. Bauers swung at 6.
Out of the zone: 4 pitches. He chased 1.
Snell never got him to expand. Every pitch pushed Snell back toward the plate.
Bay Liskey retweeted
Pitch 1: slider in the zone, taken for a strike.
Pitch 2: changeup in the dirt - take
Pitch 3: four-seam low - take
2-1. Bauers doesn't offer at either miss, and now Snell is behind.