A dancer tells how her teachers noticed how much stronger she was the day after she removed her belly piercing. She told all her friends to take their piercings out and nearly all of them noticed a difference too (all except two).
If we put a “nail” through the skin, the flexor withdrawal reflex means we must facilitate some muscles to pull away from it. As the abdominals (in this case) are facilitated, the antagonists (low back extensors and rotators) will be inhibited.
Removing the inhibition allowed this young woman to dance better and got rid of her low back pain.