Which muscles need to be strengthened if they are nonmirror muscles?

If a muscle is a non-mirror muscle, you will need to strengthen its mirror muscle.

Non-mirror muscles often develop to compensate for an imbalance or weakness on one side of the body. So strengthening them will help restore balance and symmetry to the body.

Therefore, if you want to strengthen a non-mirror muscle, it is important to also strengthen its mirror muscle and improve the overall symmetry and balance of your body.