Here's a practice scene that happens on every Little League field in America: coach sets up a fielding drill, kids run it the same way 15 times, it looks smoother by rep 12, and the coach goes home feeling good about the session. Reps happened. Improvement was visible. Progress was made.
Except in the next game, the same player boots the same grounder. And the coach is baffled.
This is the blocked practice problem — and it's the most common mistake in youth baseball coaching that almost nobody talks about.
Blocked vs. random practice: the difference
Blocked practice means repeating the same skill in the same way, over and over, before moving on. 15 grounders hit to the same spot. 20 tee swings at the same location. Throw to first 10 times in a row.
Random practice means mixing up tasks or conditions within a practice. Grounder to the left, then a fly ball, then a grounder to the right, then a throw to second. Different pitches at different locations. Different situations every rep.
The counterintuitive research finding: during practice, blocked practice looks better. Players improve faster in blocked conditions. Performance within the practice session climbs quickly. But when tested later — or in a game — the blocked practice group retains less and transfers less.
The random practice group looks messier during practice. Performance within the session is lower. But retention and transfer to game situations is significantly higher.
Why this happens: the desirable difficulty principle
The brain learns by being challenged to reconstruct a skill each time it's needed. In blocked practice, the brain "caches" the last repetition and essentially replays it. No reconstruction needed. Easy, fast, looks smooth. But the reconstruction process is what builds the memory trace that lasts.
In random practice, the brain is forced to start from scratch on each rep because the context has changed. This is harder. It feels less smooth. It requires more cognitive effort. And that effort — what researchers call "desirable difficulty" — is exactly what produces durable learning.
Think of it like the difference between rereading a chapter you already know and being tested on it. Rereading feels like studying. Being tested feels harder. But being tested produces far more retention than rereading. The difficulty is the mechanism of learning, not an obstacle to it.
What this looks like in a 60-minute practice
You don't need to throw out all your drills. You need to introduce variability into how you run them.
Fielding: Instead of 15 grounders to the same spot, mix in short hops, slow rollers, balls to the left, balls to the right, and occasional fly balls — all without a pattern. The fielder never knows what's coming. That uncertainty is the point.
Hitting: Instead of 20 tee swings at one location, alternate inside and outside locations randomly. Better: mix tee work with soft toss and coach pitch in the same station. The hitter has to read and react each time.
Throwing: Instead of 10 throws to first in a row, vary the distance, vary the target, vary the scenario. Throw to first, then throw to second, then hold while a runner is called, then throw home. Every rep is a different problem.
The practical objection: it looks like chaos
It does, initially. Random practice is messier than blocked practice. Kids will be less successful on each individual rep. That feels bad to coaches — and to players. There's a natural human desire to create conditions where people succeed.
The reframe: errors in random practice are not failure. They are the evidence that learning is happening. The error is the brain encountering a problem it doesn't yet have a cached solution for. Solving that problem — even imperfectly — is how the solution gets stored.
This doesn't mean random practice should be overwhelming. The variability should be within a range the player can plausibly handle. A 7-year-old shouldn't be fielding 60 mph grounders randomly placed. But a randomly placed soft grounder — left, right, short, deep — is absolutely appropriate and more productive than 15 grounders to the same spot.
Small-sided games are random practice at scale
This is why small-sided games belong in every rec ball practice. A game is by definition random — no two reps are the same, the hitter doesn't know what's coming, the fielder doesn't know where the ball will be hit. Game-like conditions produce game-like retention.
A well-run small-sided game at the end of a practice consolidates everything that was worked on in the session. Players are applying skills in a random, reactive context — which is exactly the context they'll face on game day.
What to do this week
Pick one drill you run every practice. This week, add one variable: different location, different target, different speed, different scenario. Just one variable. Watch how players respond when they can't predict what's coming. Watch whether the session feels messier — and trust that the mess is the mechanism.
Then check the next game. Watch whether the skill shows up differently when it wasn't drilled in the same way 15 times. It usually does.