i used to do squats, deadlifts and stiffleg deads for along time now i can not because everytime i do my lower back where the vertabres meet the tailbone hurts like a mofo so bad i can hardly move recently i did only two sets of stifflegs and i had no pain or problems and the next day i could feel the pain setting in and when i reached to put my shoes on there was a pop in my lower back and i fell to my knees in severe pain and laid on the floor for some time before i could mamnge to get myself on my feet?? that was scary the next mourning after that i could not get out of bed i hurt so bad i could not move my back, so today i feel better but i have to be carful or i might lose it agin and take it out. so my question is why do i not feel any pain when i do the movements but it sets in the next day??