How To Find an Asymmetry
An imbalance between your left and right side almost never announces itself. It gets covered up, and the thing covering it up is usually a barbell.
A bar does not care which side pushes it. Load two hundred pounds across your back and the stronger hip can quietly take an extra ten percent for years, and every rep will feel normal.
Where it stops hiding
Take one limb out of the equation and the covering stops working.
Split squats, step-downs, single-leg deadlifts. Single-arm presses and single-arm rows. Now each side has to do its own job with nothing to lean on, and differences that were invisible under a bar become obvious inside two reps.
Watch for three things. How many good reps each side does before quality drops. Whether the joint holds its position or drifts. And whether one side needs to shift or lean to get through the movement at all.
The difference is the information. Not the absolute number.
What an imbalance costs
Compensation. That is all it is, and it is enough.
The body will complete the movement either way. It just routes the load somewhere it does not belong, and the place it lands is where you eventually feel it. Overloaded lower backs and irritated knees are usually a hip somewhere not taking its share.
It also caps you. The weaker side is the ceiling on everything that uses both, so the strong side is never fully used either. Closing the gap usually raises the whole thing without training the strong side at all.
Closing it
Two steps, and the second one is the one people skip.
Isolate. Train the weak side directly, on its own, until it can do what the other side does. Extra sets on that side alone. No shame in the volume being uneven, that is the point.
Integrate. Then put it back into full-body movement, so the body actually recruits it during the pattern rather than only when it is asked in isolation. A side that is strong on its own but still ignored in a squat has not been fixed yet.
Then check again. Asymmetry is not a thing you fix once. Sport keeps creating it, so finding it becomes part of the routine.