First, some background.
The “couple other guys” Johnson referenced were Jorge Alcala and Jhoan Duran. All three were optioned to the minor league side this week but all are highly touted arms in the organization. Chalmers, who was acquired in the Fernando Rodney trade in 2018, impressed in the Arizona Fall League. He flashed a mid-90s fastball and, what one American League scout told Baseball America, the best curveball in the fall league. He has swing-and-miss stuff, the critical lifeblood to becoming a successful modern pitcher. In 17.2 innings facing the game’s most promising prospects, Chalmers struck out 25. That said, he also walked 12 in that same time.
Johnson referenced velocity when comparing Chalmers to Alcala and Duran. The latter two have seen their fastballs touch triple-digit territory while Chalmers has not. Johnson says there is a mechanical reason for this.
Here are the three pitchers from their 2019 season:
Chalmers differs in his delivery in the use of his lower half, beginning with his feet. This is the critical component of a pitcher’s mechanics as pitchers who have the tendency to get to their toes limit their velocity ceilings. This is something that Jose Berrios' has wrestled with last season using quad-dominant mechanics. Johnson spoke extensively about the subject last spring, noting how having contact into the ground through the heel (but really the entire foot) aids in creating additional hip speed by engaging the gluteus muscle along with the quadriceps muscle.
Here are shots of the pitchers’ feet. Notice that Chalmers’ foot is entirely on his toe while Alcala and Duran maintain more contact throughout. Chalmers gets quad dominant quickly. This leads to reduced hip speed which leads to lower peak velocity. Velocity, it is said, comes from the ground up.
More issues can spring from these mechanics. When using predominately the quad muscle, less velocity and more stress is put on the arm. It may be one of the reasons Chalmers required Tommy John surgery in April 2018 while with Oakland, placing additional strain on the UCL. Another factor is command. When rotating from a stable full-foot, there is consistency in the mechanics.
The Twins aren’t guessing on all this either. Sure, they can look at the video or watch a bullpen session and see this happening, but with the various array technological devices at their disposal, they can break down exactly what these movements mean to the pitcher.
Starting with the release and working backwards, the Twins have available to them the standard pitch flight data systems available, like Trackman and Rapsodo devices, which measure the velocity and spin rates. They can track release point consistency as well. They have a legion of Edgertronic cameras which isolate all or small portions of the delivery, including how the ball comes out of the hand. These programs have now been widely utilized throughout baseball. Even some high school programs have invested in that equipment.
Here is where things start getting advanced. From the ground up, the Twins recently invested in Newtforce ground plates. These data-collect mounds allows the Twins to capture how much pressure and where during the delivery process it is being created or applied. They can tell a pitcher just how much force they are generating from their back leg. On the field, the Twins have a Simi Motion system installed at Target Field and now at Hammond Stadium. This system can feed the team’s analysts information on components like hip speed, the driving factor in velocity, or valgus stress applied on the elbow (which could be an indicator of potential injury risk).
In short, the Twins are no longer just visually assessing pitchers and telling them to make changes. They come armed with more data than NASA.
The Twins players themselves are not necessarily diving into all the data after every pitch or every outing. Taylor Rogers says that he does not look at the information unless a coach notices something is off. Others have used the numbers to improve. Trevor May spent last season adding to his velocity and cited hip speed as a factor. The key has been having a coaching staff and analytic department that has worked together to identify and deliver the message to the player in ways that can help them understand how it will help them on the field.
The other aspect is implementing the plan that the Twins create for their pitchers. Chalmers, for example, could be told exactly what he needs to do -- i.e. stay in his heel more and engage his glute more -- and be on board with the plan, but that specific movement may require additional physical preparation on Chalmers’ part. A pitcher could lack some hip mobility that would restrict his movements. The Twins training staff assesses all their players to figure out how their bodies move and then creates a plan to help them reach optimal movements. Chalmers told Twins Daily’s Seth Stohs that he had spent the off-season working on strengthening his core and lower half to stabilize his delivery.
Still, given Johnson’s quotes this spring, the Twins haven’t seen Chalmers incorporate those changes in his mechanics just yet. Furthermore, Chalmers will be on an innings restriction so his work this spring has been varied from that of Alcala and Duran. If he does, we may see an uptick in his velocity, command and health this season.
When contemplating the immediate potential of the three arms just sent down to the minor league camp, Johnson says the Twins are looking for swing-and-misses to add to the big league staff. “Those are the guys that impact your bullpen. We don't need ground ball guys coming in out of the 'pen.”
Swings and misses can come from breaking balls, such as on Chalmers’ impressive bender, but velocity always helps play it up. 96 is cool but 99 is really cool.
While this is a story of just one minor league pitcher’s journey, the real takeaway is how impressive the Twins development system has become in a short period of time. With numerous tools and minds at their disposal, the Minnesota Twins could soon be a pitcher development factory unrivaled in the game.