Okay, so I got really curious about Aroldis Chapman’s arms – you know, the guy who throws absolute fireballs? I mean, how does he do it? So I dove into a little project to understand his mechanics, and, well, let me tell you, it was a deep dive.

The Deep Dive Begins
First, I started by just watching a ton of videos. Slow-motion replays, game highlights, anything I could find. I really wanted to see what was going on, not just read about it. I watched it over and over.
Building a Mental Model
Next, I started trying to break down the motion piece by piece. I mean, I’m no expert, but I started to notice things. Like, it’s not just his arm, right? It’s his whole body. The way he uses his legs, his core, the crazy rotation…it all adds up. I’m not doing it right, I need to watch more.
My Own (Clumsy) Attempts
Then came the, uh, “fun” part. I tried to mimic some of the movements myself. In my living room, that I just cleared out. Note: I did NOT throw an actual baseball. I used a rolled-up sock. And, yeah, it felt awkward. Really awkward. It gave me a whole new appreciation for the athleticism involved, I felt like throwing up trying.
Gathering the Data
While “practicing” (and I use that term loosely), I tried to jot down what I felt. Where did I feel tension? What muscles were engaging? It was all very, very unscientific, more like scribbling notes on a napkin. Some were even unreadable!
Refining and Repeating
I’d go back to the videos, compare my notes, try again, adjust… It was a cycle. Watch, feel, adjust, repeat. I did this over and over again.

The (Very Preliminary) Conclusions
So, what did I learn from this whole experience?
- It’s a full-body effort. Seriously, the power comes from the ground up.
- Flexibility is key. I definitely don’t have enough.
- Coordination is insane. Everything has to happen in the right sequence, at the right time.
- I am not Aroldis Chapman. Not even close.
Overall, it was a fascinating little experiment. It gave me a tiny glimpse into the crazy mechanics of a world-class pitcher. Will I ever throw a 105 mph fastball? Absolutely not. But I definitely have a new respect for the guys who can.