HOW TO:
Strengthen your lower back

This exercise is an easy one to do anywhere to add some much needed strength to our lower back - it can often get sore after running, and this will help you to reinforce your back strength.
Try to make sure your legs are completely relaxed so that its just the lower back that engages. ...
Pause in the extended position for 3-5 seconds each repetition.

Don't be surprised if you don't get a very big range of motion - this area is quite limited in its range of motion, and if the muscles are weak or the joints are less mobile for whatever reason, then your range of motion may be limited. mother of the groom wedding dresses

Perform 2 - 3 sets of 8 to 12 reps
https://youtu.be/Fk9qweqNEHk