Nunchaku Made My Weak Arm Obvious (I'm Not Saying Which)

The last two posts here were about grip and about pain — becoming a stronger gripper and getting my hands to hurt less by the end of a desk-work day. Both true, both good. Neither is the benefit I’m actually most excited about right now.

The one I didn’t see coming is more boring to say out loud and more useful long-term: nunchaku are showing me, in real time, that one of my arms is behind the other. And they’re forcing it to catch up.

Nunchaku don’t let you hide it

Here’s the thing about this practice that makes it different from most single-arm training: the entire point is smoothness. A strike, a catch, a hand-off from one side to the other — it’s all supposed to flow, one motion into the next, without a hitch.

A weak or uncoordinated arm cannot fake that. Lift a dumbbell with a weaker arm and your body will quietly cheat for it — a little extra lean, a shrug, momentum borrowed from somewhere else. Nobody watching casually would clock it. Try to catch a moving weight smoothly with a side that isn’t ready for it and the whole thing stutters, visibly, immediately, in a way you cannot talk yourself out of noticing.

I now know, with total confidence, which of my arms is behind.

I am not going to tell you which one. You’ll have to fight me to find out.

Why this matters more than grip strength does

Grip strength is a good headline. “Look how strong my hands got” is a fun thing to say at a gym. But it’s a single number, and a single number can hide a real problem sitting right underneath it — because you can have an excellent dominant-side grip and a mediocre off-side grip and the average still sounds impressive.

What actually determines how my body holds up long-term isn’t the average. It’s the gap. Two arms that are both fine is a completely different physical situation from one excellent arm and one arm quietly compensating for itself, even if the two situations can produce similar-looking strength numbers on paper.

Most training doesn’t close that gap on its own. Symmetric training — same sets, same reps, both sides — keeps the ratio exactly where it started, because the strong side improves at the same rate the weak side does. You need something that either deliberately loads the weak side harder, or that simply won’t function unless the weak side does its share. Nunchaku turned out to be the second kind by accident.

Where the imbalance actually came from

Nobody sets out to build a lopsided body. It happens quietly, over years, through a hundred small choices you never framed as choices.

I type for a living, which already loads one side of a keyboard-and-mouse setup more than the other. BJJ has its own version of this: grips, passes, and go-to submissions tend to build around whichever side felt natural first, and a good grip can compensate for a weak one for years without either grappler noticing. I’d bet most people reading this have a side, and most of them have never trained it on purpose.

The oversized pair made the whole thing more obvious, not less. A lighter, more forgiving set lets pure hand speed paper over a timing problem. More mass doesn’t allow that. A late or sloppy catch on the weaker side isn’t a subtle miss anymore, it’s an obviously worse rep, every time, immediately. Going up in size didn’t just make me stronger. It made the gap between my two arms impossible to keep ignoring.

Why I’m happy about this, specifically

Because I caught it. That’s the whole reason this is good news instead of just an observation.

An imbalance you know about is a training variable. An imbalance you don’t know about is just how your body quietly ages — one side compensating a little more every year, for decades, until a shoulder or an elbow or a wrist that was never actually the problem finally gives out from carrying someone else’s share of the work. I’d rather find out now, at a stage where fixing it is just extra deliberate reps on one side, than find out later as an injury with no obvious cause.

So the goal from here isn’t a stronger grip or less hand pain, even though I’ll happily take both. It’s even development. Both shoulders opening up the same amount. Both forearms doing their share. A body that’s strong the same way on both sides instead of strong on average.

The part I’m keeping to myself

I know which arm it is. I’m not telling you.

Partly because it’s genuinely more fun this way. Mostly because the only honest way to find out is to roll with me and feel it yourself — which side gives a little more, which grip lets go first, which frame collapses a beat sooner than the other one does. Come find out on the mat. I’ll even let you believe you guessed right, either way.