I know a lot of personal trainers that will claim that they can fix your problem(s). Can they? Well, it depends on the personal trainer, your individual issue(s), and what is meant by “fixing” it.
Let me start this discussion with a confession. Most people wouldn’t know this, but, I’m in physical pain, every day, and have been for years. It’s not overwhelming, but it is annoying. I have spinal stenosis that creates a radiating nerve pain down my right leg. I have a torn meniscus in my left knee. I have arthritis in both of my thumbs which make gripping things painful. I had a complete shoulder replacement about five years ago (Although, this is no longer a source of pain. My shoulder feels great these days.). And then there are the day to day aches and pains that we all deal with as we get older. Yet, in spite of all this, I teach group fitness, lift weights, and do pretty much anything I want. My, “issues” do not limit my activity. This is because I work out regularly and consistently challenge myself. Am I “fixed”? No, but I am soooo much better than I would be if I wasn’t working out.
That’s my story, but could it fix other issues? Well, it’s not going to get rid of arthritis (but, it can increase your ability to do what you want and it can diminish the sense of pain.) It’s not going to reattach torn ligaments (but, it can strengthen the muscles surrounding the area and may allow you to continue activity without surgery [always check with your doctor]). That said, if you are having back pain because of weak core muscles and poor posture, yes, the right workout with a qualified personal trainer can correct this condition. If you are having pain that is determined to stem from improper gait or movement patterns, yes, these can be corrected and alleviate the pain.
So, yes, working out can “fix” some problems and can make the best of others. The key is to check with your doctor and with his/her approval, find the right personal trainer to work with and you can be on the road to a better quality of life.