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According to Dr. Stuart McGill, traditional exercises that train the posterior chain of the body or the muscles behind the body, such as pulling, good morning, and rowing, tend to create a large shear force at the intervertebral disc between L4 and L5.
The kettlebell swing, though also used to train the back of the body, has the opposite effect.
Dr. Stuart McGill is a professor at the University of Canada who studies spine strength and health.
The point made by Dr. Stuart McGill is important because backward shearing puts more pressure on the associated tissues of the spine, so kettlebell swinging is a good way to train the back chain for those who have lower back problems, especially a herniated disc.

Because of the dynamic nature of the kettlebell movement, it is difficult to apply excessive weight, and injuries are relatively rare.
Kettlebell swinging should be an explosive exercise.
If you don’t know what an explosive training action is, consider the difference between a bullet and a missile: a bullet accelerates faster, whereas a missile travels at a constant speed, no matter how fast or slow it actually is.

Because of these two characteristics, kettlebell swinging training may be helpful for people with lower back problems.
In addition, because of the small weight, the bodybuilder can do a higher number of repetitions and therefore is more likely to Muscle flushing.
Dr. Stuart McGill cites Jay’s research in his book, Muscle Flushing, because exercise causes more blood to flow to the moving muscle tissue, bringing more nutrients to that area.