Woke up this morning and bent to pick up my bedding when my back siezed up. I've never had this before.
I can turn side to side. I can't bend front to back.
Is this normal when exploring new range of motion?
I'm 37. Not unfit ie I do jujitsu, go for 7km runs 2 x each week. First time I experienced something like this, so I'm a little bit worried...