Around a week ago I was doing some yoga at home, including some deep back stretches. Since then I have felt the need to 'crack' my back all the time, which isn't something I have ever experienced before in any of my joints. It doesn't hurt, but I'm guessing this isn't going to be good for my back! Does anyone have any idea what could have caused this? Will it resolve by itself? Do I need to try and resist the urge?!