“” Robbie Tenerowicz: The Swing Transformation of a Reds Minor Leaguer - Driveline Baseball

Robbie Tenerowicz: The Swing Transformation of a Reds Minor Leaguer

| Blog Article, Hitting, Offseason Training
Reading Time: 14 minutes
robbie tenerowicz


After his third season of professional baseball, Robbie “Byrd” Tenerowicz knew he needed something. Something that would take his game to the next level, give him the tools he needed to compete and perform with the best athletes in the world, and ultimately accomplish his dream of making the big leagues. 


Byrd arrived at Driveline in October of 2019. We did with Byrd what we do with any hitter that comes through the doors of Driveline — we took him through our world-class hitting assessment. 

Assessment – 10/1/2019

After the assessment, the main areas of improvement we identified for Byrd were his:

  • Bat speed
    • His average bat speed at 71 mph was too slow
  • Peak exit velocity
    • His peak exit velocity at 99.2 mph was too low
  • Average launch angle on hard hit balls
    • His average launch angle of 7.52° was low
  • Average exit velocity
    • His 87.58 mph average exit velocity was too low

Fast forward to March 2021, after 18 months of training, and his swing looks like this now

March 2021

Pretty big difference right? Check out these data gains too:  

  • Average Bat Speed: 
    • 71 → 73.7 = +2.7 mph
  • Peak Exit Velocity: 
    • 99.2 → 111.1 = +11.9 mph
  • Average Launch Angle of Hard Hit Balls: 
    • 7.52°→ 18.41° = +10.89°
  • Average Exit Velocity: 
    • 87.58 → 92.76 = +5.18mph

He swings the bat faster, hits the ball harder, and produces more batted balls in optimal launch angles. All of these are desirable traits for being good at baseball. Let’s hit the rewind button for a second and dive into how Byrd made these changes.

**Side-by-side before and after video can be viewed with this link


We’ll start with his bat sensor data. The main metrics we are looking at with Byrd are his average bat speed, average attack angle, and peak bat speed. 

Assessment Blast Motion Metrics – 9/30/2019-10/4/2019

Although Byrd was an above-average performer during his time in the minor leagues, the lowest hanging fruit for him was definitely improving bat speed and adding loft to his bat path. For training bat speed, we utilized a lot of concentrated bat speed training/programming with the Axe Bat Speed Trainers

We addressed his low attack angle by fixing some posture issues he had in his mechanics (see K-Vest section). The results for both his bat speed and attack angle were outstanding.

  • Average Bat Speed: 71 → 73.7 = +2.7 mph
  • Average Attack Angle: 4° → 15.07° = +11.07°
Recent Blast Motion

Byrd’s increase in bat speed has given him the ability to hit the ball harder than he did before, and raising his attack angle from 4° →  15° allows him to hit for more power than he has in previous seasons.

*Note on attack angle. Although Byrd needed to make attack angle adjustments and raise his average attack angle, 15° is likely a little high in comparison to where he would live in the game. In the context of a training environment, (where we are occasionally solely focusing on bat speed or optimal ball flight) attack angles are typically higher than what we see in a live-at-bat setting. I would expect his in-game attack angle to live anywhere between the 8°-12° range. 

Batted Ball

Now let’s take a look at Byrd’s batted ball data from his assessment week. The main metrics we’re looking at here are peak exit velocity, average launch angle of hard-hit balls, and average exit velocity. What we saw with Byrd was a hitter who did not hit the ball hard enough, and when he did hit the ball hard, he’d hit it at a ground ball trajectory, which is not ideal for success. 

Assessment Batted Ball Report – 9/30/2019-10/4/2019

However, when we look at Byrd’s recent batted ball data, he’s made substantial progress in all of the targeted areas. 

Recent Batted Ball Data
111.1 mph exit velocity PR 

His batted ball changes are highlighted by improvements to the following metrics:

  • Peak Exit Velocity:
    • 99.2 → 111.1 = +11.9 mph
  • Average Launch Angle of Hard Hit Balls: 
    • 7.52°→ 18.41° = +10.89°
  • Average Exit Velocity: 
    • 87.58 → 92.76 = +5.18mph

By executing a bat speed program and making a slight adjustment to his swing plane, Byrd improved the quality of his batted balls. His increased bat speed led to a substantial increase in peak and average exit velocity. Raising his attack angle from  4° → 15° makes it possible for him to elevate his average launch angle of hard-hit balls. More exit velocity + line drive ball flight = productive batted balls.

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When Byrd came to Driveline in September 2019, his K-Vest graphs revealed posture issues that were making it difficult for him to hit the ball hard and in the air consistently. The K-Vest metrics we addressed in his swing were: 

  • Torso Forward Bend:
    • The goal here was to add more torso forward bend at heel strike and move away from standing so upright 
  • Pelvis and Torso Rotation at Heel Strike :
    • We wanted to put him in a better position to maximize the timing of hip-shoulder separation and thus increase his bat speed. This was accomplished by getting Byrd to generate even amounts of coil with his pelvis and torso during the load phase of his swing
Assessment K-Vest


In order to fix these issues, we laid out a detailed plan of attack that is best summarized by clipping one of the training log entries we wrote for him in October 2019. 

Training Log Entry – October 2019

What we are looking for in the upper body graph above, is equal values of torso forward bend, side bend, and rotation and side bend at contact will be greater than or equal to forward bend at first move (equal on a pitch at the top of the zone and greater than for pitches lower). So, if you have very little torso forward bend as you begin to rotate towards the ball, it is unlikely you will create enough side bend to rotate on plane with pitches lower in the zone. Below is an example of an efficient upper body graph for reference.

On your good swings, you do not lose as much forward bend, and instead, you replace forward bend with side bend at contact. For you, we are looking to add a little more forward bend at first move and more side bend at contact. This will help you hit the low pitch flush with more elevation. 

You demonstrate very little forward torso bend while maintaining a significantly higher value of anterior tilt of the pelvis. This means you are arching your low back to load yourself rather than rotating the pelvis. Low values of torso bend can be associated with standing very tall at the plate and a lack of hip hinge. This is important to your swing for multiple reasons. 

  • Because you demonstrate more anterior tilt than forward bend, this indicates a poor hip hinge pattern that loads the anterior muscles of the leg rather than the stronger posterior chain muscles such as the glutes and hamstrings. Loading the anterior chain muscles makes it difficult to control your posture throughout the swing and rotate the pelvis immediately upon toe touch (controlling posture is more your problem). In addition, you are losing out on power by not using the most powerful muscles in your body to their potential (glutes and hamstrings).
  • The other aspect to consider with too little forward bend or hinge, is that remaining tall throughout the swing can limit your ability to hit balls down in the zone with a positive attack angle, and hit them high enough for home run trajectory. This makes sense considering your swing and your complaints of getting no carry on your hard-hit balls because they are hit with a glancing blow causing too much backspin and losing out on potential smash factor. 
  • It is ok to stand tall at the plate as long as forward bend and pelvic tilt values remain similar, indicating a proper hinge pattern. Hitters who stand tall, tend to hit the pitch up in the zone better than low in the zone, which is something that you struggle with. Adjusting your posture to optimize for your strengths is something we will attack throughout the offseason.

Swing Improvement Plan 

  1. Gain strength in the upper body to improve stability in the posterior shoulder. This will allow you to load the shoulder joints more effectively, rather than relying on creating speed by just releasing the wrists at the right time. This could also improve your ability to keep turning your torso through the pitch while holding the load in your shoulders and wrists if fooled, or when/if you have to turn more than expected.
  1. Improving the ability to hinge and add more forward bend to your posture. This is to maximize your ability to make hard contact with the pitch down and start hitting that pitch flush and in the air. We will also develop an approach around this new move and increase awareness of the “new” top of your zone. Adding forward bend will lower your sights in the strike zone and can help you lay off pitches up in the zone. These pitches will look higher and we will train to gain the awareness of if you are coming up and out of your hinge and posture. If this happens it is likely a pitch that you cannot drive and is probably a ball.
  1. Gain more control of your pelvis and core area by strengthening the pelvic floor muscles and training your ability to rotate from the pelvis rather than arching the low back, extending the hips, and loading the anterior muscles of your leg (quads). We will coach you on the hinge in your warm-up and recovery as well as in the weight room. Dead bugs will be your best friend. 
  1. Most importantly, swinging with the intent to move the bat fast and hit the ball flush in the air. Intention and the practice environment is the most important part of your training and in the first block, we will focus on this intention heavily. Many of the mechanical adjustments we are looking to make can be addressed in the weight room and in our warm-up and recovery. 

The information on your swing mechanics and batted ball profile is meant to provide context and awareness to issues, but executing this plan will be all about intention and developing a routine to sustain these changes to your body and mindset.

A few visuals:

Suarez at roughly the same point in the swing. More side bend of the torso and pelvis, creating more loft in his bat path deeper in the zone in comparison to your bat still having to travel quite a bit further before the upswing starts.

Correa creating loft in little earlier in his swing with shoulders rotating more underneath each other. This is a product of added forward bend and maintaining spine angle throughout the swing. Check out some of the ways we use hitting Plyo Ball ® to change bat path.

New Swing vs. Old Swing

Byrd’s previously mentioned swing flaws are best visualized by looking at some of his swings from the minor leagues. Homerun? Yes. Good swing? Kind of, but not really. 

2019 Season

Hit the fast forward button, and below are some of his swings from training. In these swings, there is noticeably more torso forward bend at heel strike, and he maintains his posture – replaces forward bend with side bend – much better than he did before. You’ll also notice his bat path improvements. With his increased attack angle, he’s now able to create loft with his swing on pitches down zone, and his improved swing depth gives him a larger point of contact range to make flush contact.   

The mechanical improvements become even more prominent when looking at pitches on the inner half of the plate. 

2019 Season
Live AB Homerun at Driveline – February 2020

Lastly, a couple of side-by-side comparisons illustrate these mechanical improvements even further. 

Recent vs. Assessment 

Comparing the recent swing on the left versus an assessment swing on the right. We can see noticeably more hip flexion and torso forward bend than the swing on the right. This is also evident in the K-Vest performance graphs (see pictures at beginning of the section).

Recent vs. Assessment 

In this visual, we can see noticeably more forward bend and side bend of the torso in the swing on the left which allows for a deeper entry into the zone and an ability to adjust to the pitch with posture rather than just throwing his hands at the ball.

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Cancelled 2020 Season

Re-tooled, revamped, and rejuvenated, Byrd made his way down to spring training 2020 with the Tampa Bay Rays. However, after just three weeks, spring training was cancelled because of Covid-19. Pretty tough blow for a guy who was ready to roll. Nonetheless, Byrd returned to Washington to continue what he’d started. After being back for a little less than a month, Byrd got a phone call from the Rays letting him know that he’d been released. Boom, that one hurts. Another tough blow, but definitely not enough to stop Byrd from continuing to get better. With Driveline closed because of Covid, we got back to work outside. Even with an uncertain future, Byrd continued to improve and re-tool his swing every single day. 

Summer 2020
Summer 2020 Live At Bats

Getting Ready for the 2021 Season

When Driveline re-opened at the end of the 2020 summer, Byrd’s swing, approach, and mindset were in as good of a place as they’d ever been. He continued his development, and the Reds took notice and signed him to a minor league contract. With a place to play and a new swing, a lot of the training leading up until spring training was geared towards maintaining and challenging his new patterns and approach. This meant hitting in fast-paced and game representative environments. For an example of what this looks like, here is a clip from a fastball training session, where we had the machine set at 95mph, 12:30 spin axis, and 2500 rpm. 

The idea here was that we wanted to stress test Byrd’s new swing and make his new changes even more “sticky” for when spring training, and ultimately the season, rolled around. One of Byrd’s most memorable training highlights came when he finally accomplished his goal of hitting a ball over 110 mph.  

110.4 mph Exit Velocity PR

If this doesn’t fire you up…make sure you check your Motus. He’s since hit a ball 111.1 mph, but the first one over 110mph always hits a little bit different. After 18 months of training at Driveline, we finally uncaged the Byrd and sent him off to spring training, where he could spread his wings and fly…

Spring Training

…and fly he did!

After a successful Spring Training, Byrd has started the 2021 season with the Double-A Chattanooga Lookouts. Safe to say, all of us here at Driveline are very excited to watch him perform this year!

Closing Thoughts 

For some closing remarks, I’d like to reconstruct Byrd’s training timeline:

  • October 2019 – Arrival at Driveline 
  • October 2019 to February 2020 – 5 months of training at Driveline
  • March 2020 – Spring training cancelled, goes back to Washington, and gets released by the Rays
  • April 2020 to June 2020 – Trains outside and continues to get better
  • July 2020 to March 2021 – Driveline re-opens and he continues to train, up until leaving for Reds spring training 

That’s 18 months of training without playing a competitive baseball game…18 months! Byrd is proof that baseball players can be developed if they expose themselves to the right training/information and put in the work every single day. Action expresses priorities, and if you want something bad enough, your actions will follow suit. 

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By John Soteropulos and Max Dutto

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