Even if you dont feel problems now, its worth the relatively low cost to get a full-body check in case there are some underlying problems that'll cost you a lot of time and money in the future!
I called up a local sports therapy guy, hes been working for 16 years and he said no one has EVER called him up for a check-up before, people only ever contact him once they've had an injury.
I contacted him in the first place because this past year ive been working 9 hours a day at a computer (on a fairly bad chair), do little exercise other than walk to/from work, and previous to that ive had sciatica and generally bad posture. Most of which are entirely my fault, i understand, which is why i wanted to go and see someone who could point me in the right direction towards fixing those problems. So i knew he would definitely find problems.
*break*
After checking me out he made a list of everything he found, from minor problems, common problems/characteristics, and problems that are small now but would be huge in the future. I only had to see him twice and he gave me a list of exercises that would work towards fixing my general muscular imbalance and ran me through them to make sure i could do them properly.
He told me that now i have the exercises i can just get on with doing them and dont have to go back to him. basically. He said he has clients that come in every week and pay him to help them do exercises, simply because they are too lazy to do the exercises themselves.
Anyway, check it out now for cheap, or pay a lot of money later in life
ps i also went to a chiropractor for a nuber of sessions last year when my sciatica kicked in and he helped a lot