Your corrective exercises shouldn't be done for repetitions, but with attention and intention to correct the fault - which could take 2 reps (the first being outside acceptable, the next being acceptable).
Repeating it after that is conditioning.
I put it to you that if you correct a movement, rather than continue to condition in that position/pattern combination, progress to a higher position with the same pattern, until you're performing the pattern in standing. Along the way, load can be used to help the pattern or stimulate it to be better.
Once your pattern is acceptable in standing, adding load to resist the pattern begins the conditioning process.
Doing it any other way is borrowing movement from somewhere else to finish a pattern.
The stickler for being acceptable is three-fold:
For safety reasons.
For efficiency reasons.
To improve the chance of success of completing the pattern.
Here's an example:
Overhead reaching is dysfunctional.
Lower body rolling from prone to supine is dysfunctional on the first rep because the person leaves the eyes facing the floor and head facing the floor. The second rep is corrected (the eyes turn to the side of the arm reaching, and the neck remains rotated throughout, then movement is smooth and easy. A Cook band can provide compression to stimulate stability elsewhere.
Instead of doing reps, progress to quadruped and pattern reach forward, side and then reach back to include thoracic extension/rotation. Then progress to tall or half-kneeling lifts. Then split standing or bilateral stance lifts, add resistance tubing and then med-ball for conditioning.
The 3 'ions
Attention first, then intention, will get you extension.
Attention requires healthy senses, including mechanoreceptors - this is where being healthy and having minimum mobility is important. It also requires intrinsic feedback in response to augmented feedback.
Intention requires task-focus, external cueing, and knowledge of the result, looped with augmented feedback and intrinsic feedback to provide reflection on whether to adjust for the next rep.
Extension means growth.