^^
And here we have a perfect microcosm of the internet troll.
Do you sit the whole day? Get up and take a walk every few hours you lazy git.
Can you bend forward and touch your toes?
If no - can you see your toes?
If no - go to a physio and get checked out you fat bastard. And start exercising, even a little bit will help.
If yes - still go to the physio, you probably pulled a muscle, pinched a nerve, or suffered a slipped disk.
Seriously - I pulled a muscle a few weeks ago and needed 5 sessions to sort it out (involving dry needling), and got a serious lecture from the physio about not exercising enough.