I had numbness and pain before I started the mobility work, and now I have numbness (to a small extent). However I get more numbness during and after mobility work, which then subsides after some hours. I usually start feeling it when I am doing hip opening work, where one is trying to outwardly rotate his hip, like this: https://www.youtube.com/watch?v=JBHzXF-mVjY . Having said that, I can also get numb when I stand up still for more than 30 mins.