Another method is to exercise the weaker latissimus dorsi alone, with a wider grip. For example, do a high-level pull-down. After the straight bar is pulled to about half, the weaker side continues to pull down, and the stronger side basically does not move.
Matters needing attention in practicing lateral latissimus dorsi
If you want to stimulate the lateral side of latissimus dorsi, you should pay attention to the wide grip, the grip distance is about 1.5, and you should fully stretch and contract the latissimus dorsi in each movement, reduce it to the lowest level, pull it as high as possible to the chest, maximize the development of latissimus dorsi and stimulate the lateral side of latissimus dorsi.
During exercise, don't swing back and forth, use inertia to help yourself. When doing pull-ups, the scapula should be relaxed to fully extend the latissimus dorsi.