I have a difference in mobility between my two hamstrings. The left side is much tighter than the right side. Everything on the right is dominant, and stronger for me. I have had some back pain lately, it is particularly present when I am doing 2h swings.
In order to do something with this problem I tried to do two one-legged exercises.
1 leg deadlift@12 kilo. I did it both with the weight held lateral and contralateral.
Overhead lunges@12 kilo. I did the same here.
10 minutes swing@24 kilo. 10 reps *9 sets.