By BK, Athletic Hitting Development
Complete Hitters Aren’t Born. They’re Built… and Earned.
Key takeaways
- In 39 competitive players, game-bat swing speed was about 1.3 mph (roughly 2.1%) faster after a different-style warm-up bat than after a traditional weighted-bat warm-up.
- The lesson isn’t a product. It’s that heavier isn’t automatically better on deck.
- An on-deck routine should prime speed and timing, not just make the bat feel light.
- Use the simple AHD on-deck routine below every at-bat, in practice and in games.
Heavy on deck isn’t a plan. It’s a habit.
An on-deck routine should prime speed and timing, not make the bat feel heavy. Use your game bat for about a minute: a few loose swings, a few fast full-intent swings, time the pitcher’s delivery and lock in your plan.
Train it: Athletic Development Masterclass →And a study of 39 players says it may be the slower habit.
1. What the study found
Researchers took 39 competitive baseball players and had each of them warm up two ways: once with a traditional weighted bat, and once with a warm-up bat built to change how its weight moves during the swing instead of just adding weight. Same players, both conditions.
Then they measured swing speed with the game bat. After the different-style warm-up, game-bat swing speed was 0.56 m/s faster, about 1.26 mph, roughly 2.1%, than after the weighted-bat warm-up. That difference was statistically strong.
I’m not here to sell you a bat. I’m not naming one. The point is bigger: the classic weighted-bat warm-up was the slower option in this comparison.
2. The real lesson: prime speed, not heaviness
Put this next to what we covered in The On-Deck Donut Myth. That study found heavy and light warm-up bats added no bat speed in players from 12U to college. This one found the weighted-bat warm-up lost to a speed-focused alternative.
Two studies. Same direction. Heavy isn’t the magic.
The on-deck circle is for getting ready, not getting tired.
Bat speed is built from the ground up: ground, hips, core, then hands. On deck, you want that chain awake and moving fast. You also want your timing warming up, because a fast swing that’s late is still an out. That’s See It and Time It, the first steps of the Hitting Processor, and they start before you step in.
ON-DECK ROUTINE
PRIMESPEED.
- Game bat only.
- A few fast, full-intent swings.
- Time the pitcher’s delivery.
- Heater ready. Hanger adjust.
READY, NOT TIRED.
3. The AHD on-deck routine
Here’s what we teach. Game bat. About a minute. Same every time.
- Loosen upA few easy swings from your setup. Find your hip hinge and spine tilt. Start athletic.
- Speed swingsTwo or three quick, full-intent swings with the game bat. Fast, not wild. Stay athletic through the finish.
- Time the pitcherLoad and launch with the pitcher’s delivery. Get the rhythm of his release, not just his arm.
- See the planePicture the heater in your zone and rehearse matching that plane, barrel above the ball.
- Lock the planOne breath. Heater ready, adjust to the hanger. Hunt your pitch.
Notice what’s missing: nothing heavy, nothing that changes the feel of the bat right before you need it.
4. For coaches and team practice
Run this same routine in batting practice. If a hitter only does his on-deck routine in games, it isn’t a routine. It’s a ritual.
- Build it into BP. Every round starts with the same on-deck steps.
- Keep it short. About a minute, so it fits a real game.
- Coach the timing step. Most young hitters skip it. It matters most.
- Take the donuts off the rack. Remove the option and the habit goes away.
At camps and clinics, I see whole teams swinging heavy bats on deck because that’s what they’ve always done. Change the routine once and it sticks. If you want a daily habit that trains the timing piece, start with the 5-Minute Daily Hitting Processor Plan.
Quick answers
What’s the best on-deck routine for hitters?
Use the game bat, take a few loose swings, then a few fast full-intent swings, time the pitcher’s delivery and lock in your heater plan.
Is a weighted bat bad for warming up?
In this 39-player study, warming up with a traditional weighted bat led to about 1.3 mph slower game-bat speed than a speed-focused warm-up bat.
Do I need a special warm-up bat?
No. The lesson is the goal, not the gear: prime speed and timing on deck. Your game bat does that job.
How long should an on-deck routine take?
About a minute. Short enough to repeat every at-bat, in practice and in games.
What should a hitter do on deck besides swing?
Watch the pitcher. Time his delivery with your load and lock in your plan, like hunting the heater in your zone, so you step into the box already on time.
Research: Castonguay T et al., “Warming Up With a Dynamic Moment of Inertia Bat Can Increase Bat Swing Speed in Competitive Baseball Players,” Journal of Sport Rehabilitation (2022). Findings are from the published abstract; 39 competitive baseball players, ages not given there, so how it applies to younger hitters and to fastpitch softball is coaching judgment.
Don’t collect drills. Build a complete hitter.
Complete Hitters Aren’t Born. They’re Built… and Earned.
This article is part of the AHD guide Bat Speed & Power Training. Start there for the full picture and every related article.
