Most pitchers treat a new skill like a purchase. You work on it, you get it, and from then on you own it. That mental model explains a lot of frustration. A grip that worked in January vanishes in April. A delivery fix that looked clean on video falls apart in the first cold start of the season. The pitcher assumes something broke.
A better model treats skill the way we already treat strength and speed: as an adaptation to the demands you place on it, one that improves under the right challenge and fades without it.
Why doesn't a new pitching skill stick?
Researchers in the constraints-led tradition have proposed calling the process "skill adaptation" [1][2]. Renshaw and colleagues argue that "skill acquisition" implies picking up an object or a status that you then keep. They describe skill instead as an athlete's functionality in a performance environment, something that can always keep improving [2]. Rubicon Performance, a pitching and performance company, builds its training philosophy on that idea [1].
The shift sounds academic. It has practical consequences. If skill is a fit between you and the game, then the fit can drift. Different mounds, a new level of competition, a stronger body after an off-season of lifting, a few weeks off: each one changes the conditions your movement was tuned for. The skill has to adapt again, and if practice never asks it to, it will not.
Rubicon also points to a problem baseball knows well, the "five o'clock hitter" who looks great in batting practice and fades in games [1]. When practice is too clean, the athlete gets very good at practice. The skill fits the training environment and has never been tested against the real one.
How the body learns coordination
One influential theory, from neuroscientists Olaf Sporns and Gerald Edelman, proposes that coordinated movement develops by selection [3]. The nervous system produces many slightly different attempts at a task. Attempts that work get strengthened and kept, and the rest fade. This was offered as a solution to the degrees of freedom problem first described by Bernstein: the body has far more joints and muscles than any task needs, so there are always many ways to do the same thing.
Motor control researcher Mark Latash takes that further, describing the extra options as a resource that lets the body absorb errors [4]. Rubicon compares the whole process to a small version of evolution happening inside each practice [1]. Treat that as an analogy. Selection theories of motor learning are theories, and learning within one athlete is not literal Darwinian evolution. The useful takeaway holds either way: variety in practice generates options, and success and failure decide which ones stay.
Is skill a physical adaptation like strength?
On the Rubicon podcast, the host and Chicago Cubs strength coach Steffen Simmons argue that skill follows the same adaptation rules as muscle, with a different delivery mechanism [5]. Overloading a skill, in their view, means more challenge in intensity and in the environment the skill has to work in. That is practitioner opinion, and there is supporting science for the basic idea that skill practice changes the body.
Lakhani and colleagues scanned seventeen healthy young adults before and after ten sessions of training on a visuomotor arm task [6]. After training, myelin water fraction, a measure of the insulation around nerve fibers, increased in brain regions involved in the task. The study did not involve pitching, and it does not show what any particular pitching drill does to the brain. It does show that motor practice produces measurable structural change, which is what you would expect if skill is a physical adaptation that needs stimulus and recovery.
Skill needs a training log
Track the work that builds the skill
Pitch AI logs every throwing session, intensity included, and builds your workload progressively, so the challenge in your practice can rise on a plan instead of by accident.
Adaptable vs adjustable pitchers
Rob Gray draws a distinction that helps pitchers and coaches decide how to practice [7]. An adjustable athlete has one ideal motion. Practice drills it, and variation is added late so the motion can be patched when it breaks. An adaptable athlete is trained from early on to find a new solution when conditions change. Gray argues that variety in practice is what builds the second kind.
Not every coach agrees on timing. Some teach one fundamental form with high repetition first and add variation once it is solid. The research on practice scheduling suggests the right answer depends on the athlete's level, which we cover in random vs blocked practice for pitchers.
What learning looks like in a throwing study
Kudo and colleagues gave a small group of adults 150 practice throws on an accuracy task with the non-dominant arm [8]. As accuracy improved, the release parameters (speed, angle and height of release) began compensating for one another. Error shrank because the parts learned to work together, while each one on its own stayed variable. This is a good picture of early learning in a new pitch: the shape gets more reliable as the system learns which combinations work, long before any single piece looks perfectly repeatable.
Davids and colleagues describe this kind of trial to trial variation as functional, a sign of the system adapting to changing constraints [9]. For a pitcher learning a new grip, some scatter in early sessions is normal and part of the search.
How to keep a new skill improving
If skill behaves like fitness, the planning rules look familiar:
- Keep throwing it, year round, within a sensible workload. A pitch you only throw in season gets no stimulus for months. Low intent catch play with the grip keeps the pattern active without adding stress.
- Keep raising the challenge. Bigger targets become smaller ones, blocked sets become mixed sets, an empty box becomes a hitter standing in. Our post on why bullpen strikes disappear in games covers how to set that difficulty.
- Test it somewhere new. A different mound, a new catcher, a cold day, a hitter in the box. The skill is only as good as its worst setting.
- Expect to re-earn it after time off. After a break, rebuild with the same patience you use to rebuild throwing volume. See how much time off a pitcher should take for the physical side.
Skill training can also be periodized. The PoST framework from Otte, Millar and Klatt describes stages that move from simplified coordination work, through adaptability training with more variety, to highly game-like performance training, with simpler confidence-building work just before competition [10]. In a pitcher's year, that roughly maps to exploration early in the off-season, game-like challenge in preseason and short, sharp sessions in season.
Planning horizon matters too. On Rubicon's first podcast episode, the host argues that skill learning looks messy from session to session while the long-term trend in training should look fairly steady, and that athletes need room to progress over years [11]. That is coaching opinion, and it fits how the rest of a training plan works. For how to raise throwing volume and intent in steps, read how to progress a throwing program.
Example: six weeks with a new changeup
Weeks 1 and 2: grip work in catch play at low intent, a set of ten on flat ground twice a week, shape checked each session. Weeks 3 and 4: changeups mixed into small random sets with your fastball on flat ground, then a handful in each bullpen. Weeks 5 and 6: catcher calls changeups at random in pens, including in hitter's counts, and at least one session against live hitters. Each week, compare the first ten changeups of the session with last week's. If shape or location slips, step back one stage for a week.
This series started with why elite pitchers never repeat the exact same delivery and what dexterity in pitching means. The pitchers who keep improving are the ones whose skills keep adapting.
Frequently asked questions
Why do pitchers lose a new pitch after a few weeks?
Skill behaves like an adaptation. It is tuned to the conditions you practice in and fades when practice stops challenging it or stops altogether. Keep throwing the pitch, raise the difficulty over time and test it in new conditions.
What is skill adaptation?
Skill adaptation is a term proposed by constraints-led researchers to replace skill acquisition. It describes skill as an ongoing fit between an athlete and the performance environment that keeps improving, or drifting, depending on the demands placed on it.
Does practicing a skill change the brain?
Yes. In one study, ten sessions of motor skill training increased a measure of myelin in task-related brain regions of healthy adults. The study was not on pitchers, but it supports the idea that skill is a physical adaptation.
How long does it take to learn a new pitch?
It varies widely by pitcher and pitch. A practical approach is to move in stages over several weeks, from low intent grip work to mixed sets to game-like bullpens and live hitters, and to step back a stage whenever shape or location slips.
Keep the skill adapting
Plan skill work like you plan strength
Pitch AI logs every throwing session, intensity included, and builds your workload progressively. Add Pitch Lab to log grip changes and pitch shape while a new pitch is still taking hold.
Sources and further reading
- [1] Crider B (2026). Skill adaptation. Rubicon Performance (practitioner article). https://www.rubicon-performance.com/education/articles/skill-adaptation/
- [2] Renshaw I, Davids K, Newcombe D, Roberts W (2019). The Constraints-Led Approach: Principles for Sports Coaching and Practice Design. Routledge (as quoted in [1]).
- [3] Sporns O, Edelman GM (1993). Solving Bernstein's problem: a proposal for the development of coordinated movement by selection. Child Development, 64(4), 960-981. https://doi.org/10.2307/1131321
- [4] Latash ML (2012). The bliss (not the problem) of motor abundance (not redundancy). Experimental Brain Research, 217(1), 1-5. https://doi.org/10.1007/s00221-012-3000-4
- [5] Rubicon (2026). Casting The Die, Episode 2, with Steffen Simmons (podcast; practitioner opinion). https://youtu.be/PkRCz3dhYn0
- [6] Lakhani B, Borich MR, Jackson JN, et al. (2016). Motor skill acquisition promotes human brain myelin plasticity. Neural Plasticity, 2016, 7526135. https://doi.org/10.1155/2016/7526135
- [7] Gray R (2021). How We Learn to Move: A Revolution in the Way We Coach and Practice Sports Skills. Perception Action Consulting and Education (chapter 8).
- [8] Kudo K, Tsutsui S, Ishikura T, et al. (2000). Compensatory coordination of release parameters in a throwing task. Journal of Motor Behavior, 32(4), 337-345. https://doi.org/10.1080/00222890009601384
- [9] Davids K, Glazier P, Araújo D, Bartlett R (2003). Movement systems as dynamical systems: the functional role of variability and its implications for sports medicine. Sports Medicine, 33(4), 245-260. https://doi.org/10.2165/00007256-200333040-00001
- [10] Otte FW, Millar SK, Klatt S (2019). Skill training periodization in "specialist" sports coaching: an introduction of the "PoST" framework for skill development. Frontiers in Sports and Active Living, 1, 61. https://doi.org/10.3389/fspor.2019.00061
- [11] Rubicon (2026). Casting The Die, Episode 1, with Grant Fowler (podcast; practitioner opinion). https://youtu.be/iOFTgVe4tUg