Whenever I try any fast muscle movement of hands, feet or any skeletal muscles, after 2-3 times, my muscles get stuck and jammed. While climbing the stairs, I can't climb fast. I can not run. I can not punch multiple times. Muscles take time to relax. I have undergone vit
b12 and vit D3 tests. I am deficient in both. I have started taking B12 shots, but I am not finding any difference. Am I suffering from some disease? Can this be genetic? Can thus be cured?