Have you ever been a little bit early on an off-speed pitch and grounded out to the pull-side? I mean, who hasn’t? But I’m talking about one of those swings where you jog back to the dugout thinking, “Man, I JUST missed that pitch.”
As baseball players, I think we can all relate to that feeling. One of the reasons this particular batted ball occurs so often is because of the unique relationship between point of contact, attack angle, and bat speed. The relationship works like this:
- Hit the ball farther out in front and your bat speed and attack angle will increase. This is great for hitting home runs but comes at the cost of inconsistent contact (a lot of roll-overs) and potential whiffs.
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When looking at this relationship on Edgertronic video, I began to notice the bottom hand was playing an important role in these interactions. More specifically, I started to hone in on bottom hand supination—both its magnitude and when it occurs during the swing.
While we still know that training bat speed and exit velocity offer the biggest “bang for your buck”, a bottom hand adjustment might be just what you need to raise your game to the next level. Before we dive deep, let’s review a couple of key definitions.
Supination: Rotation of the arm outwards, or a movement in which a person turns their hand, wrist, and forearm upwards
Attack Angle: The angle of the barrel’s path relative to horizontal. A positive value indicates swinging up, a negative value indicates swinging down, and a value of zero indicates swinging perfectly parallel to the ground.
To help visualize attack angle, below I’ve broken a swing into three distinct attack angle phases: negative, level (close to 0°), and positive. During the negative phase, a hitter is swinging downwards and his/her attack angle will have a negative value. During the level phase, a hitter is swinging with a path that is much more parallel in relationship to the ground, and these attack angles will range anywhere between -2° and 2° approximately. Lastly, we have the positive attack angle phase, which by this point is pretty self-explanatory.
Attack Angle Transition
Every hitter’s attack angle will transition from negative → level → positive. The manner and timing in which this transition occurs is largely dependent on an athlete’s bat path, which is largely a function of their posture… but that’s another blog post for the future.
Moreover, you’ll notice that the level portion of this hitter’s swing is much shorter in comparison to the negative and positive phases. While not uncommon, as coaches it’s important to remember that no two swings are exactly alike. Armed with knowledge like this, Driveline trainers design a training program and an in-game approach with one goal in mind: getting our hitters to RAKE.
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SUPINATION IN THE SWING
We’ve gotten through attack angle—now onto the fun stuff. When evaluating supination in the swing, I wanted to start by answering this question: What do swings look like with no supination, a lot of supination, and everything in between?
The following visuals should provide a clear answer. I strongly recommend viewing each GIF at least two times. First time, focus only on the bottom hand and the act of supination. Second time, focus only on the barrel and how it’s moving. For the ambitious readers out there, a third time through offers a great opportunity for conceptualizing the relationship between the two.
Ok, now I know what you’re thinking…“Cool vizis, but I don’t swing with one hand.” Excellent point and a great reason to continue reading!
Below are examples of two-handed swings that fall into the “most supination” category. I highly recommend using the aforementioned viewing strategy.
When looking at these swings, a few things stand out:
- Bottom hand supination and top hand pronation share a relationship. However, the bottom hand is closer to the fulcrum/axis of rotation, and this could potentially cause the bottom hand to play a more prominent role in the bat’s path
- Hard supination pulls the barrel upwards, resulting in a rapid attack angle increase.
- Hard supination alters the bat’s horizontal bath path by pulling the barrel towards the third base dugout.
Supination definitely impacts bat path, but it’s time for me to confess something… I cherry-picked these examples. Let’s look at a couple of swings that land in the “medium supination” range of the spectrum.
A few of my observations on these medium supination swings:
- The barrel continues to increase in attack angle, but at a slower rate.
- The horizontal angle of the bat continues through center field for a longer period of time, as opposed to pulling towards the third base dugout.
- Supination is occurring later in the swing.
WHY DOES ANY OF THIS MATTER?
While the act of supination alters bat path, it looks like the timing of supination plays an important role as well. Because hitting is such a precise skill, a swing that produces hard-hit balls, even when you’re not on time, is extremely valuable. Now, please bear with me while I dive into some technical details.
The optimal attack angle for contact is 6°, while the optimal attack angle for maximum distance is 18°. A swing that arcs through the zone with an attack angle between 6°-18° seems optimal. Attack angles below 6° result in ground balls as well as clipped, low exit velocity fly balls. Conversely, attack angles above 18° produce home runs, but at the cost of more high fly balls, top spun grounders, and whiffs. If excessive/early supination is raising your attack angle over 18°, it’s probably a good idea to make a swing adjustment. Without an improvement, any contact made out in front (where supination affects bat path the most) with an attack angle greater than 18° will be less likely to produce a valuable batted ball.
- Attack angles between 6°-18° are advantageous.
- Early/excessive supination may increase attack angle over 18°, leading to unproductive batted balls.
HITTING MOTION CAPTURE
While writing this blog, it was exciting to know that our hitting motion capture lab will help address these questions in a much more scientific manner. One of my main goals with this blog is to demonstrate the value of pairing swing kinematics with bat path characteristics, and then to illustrate these connections with relevant visuals. I hope I’ve succeeded on this front!
Do you feel like early or excessive supination is holding your swing back? Try these drills 👇.
Bottom Hand Drill
Purpose – Great for proper timing of supination.
Doing it Well – Supination occurs at the correct time and your barrel stays through the hitting zone. Squaring the ball up will come naturally because of the extra swing depth and it will feel like the barrel works through the pitcher for a longer period of time.
Common Mistakes – Supinate too much or too early and you’ll feel the barrel pull out of the hitting zone, upwards, and towards the third base dugout. You’ll hit a lot of pull-side top spin grounders and high launch angle (above 35°) fly balls.
Purpose – Works on two-handed barrel path and direction.
Doing it Well – You’ll be able to hit hard line drives up from gap-to-gap. Even if you catch the ball deep or hit it out in front, your swing will still produce solid line drive contact.
Common Mistakes – Pulling the bat up and out of the strike zone. This makes it very difficult to make solid contact. These swings will produce pull-side ground balls and flares to the opposite field.
Purpose – Because of the Axe Short Trainer’s size (28”, 31oz), any type of early or excessive supination is magnified.
Doing it Well – Take your game swing and hit balls flush and at line drive launch angles (10°-30°) to all areas of the field.
Common Mistakes – Hitters feel like they “run out of barrel” and mistake swings will result in top spun pull-side grounders and whiffs.
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By John Soteropulos – Hitting Trainer