I do ballet and recently, while stretching for middle splits, I have noticed that my nerves in my left foot (near the toes) kind of "pop" and it feels like they are breaking even tho they are not. I feel tingling and then it "pops" it happens when I am doing a straddle, or stretching my left leg on the side, like stretching inner thighs I think, I do not have that problem while stretching other parts of the legs, like hamstrings, calves, quads, just inner thighs. That happens every time. It is not painful, just very uncomfortable.