In reply to ben1234:
18 months ago I kept getting injured and hurting my back (days in bed etc). Having tried a physio I went to see a strength and conditioning coach, he said I had basically run/swam/biked myself to oblivion and effectively had no core strength.
He has worked with me on a gym strengthening programme - crucially he checks I am doing the exercises correctly, body position etc which is hard to do via video stuff
I hate going to the gym but the difference has been transformational to a point where I am largely pain free (I also do a set of stretches twice a day, everyday)
I still see a physio as I have a neck issue - but there is a tendency to “treat” rather than “help prevent” hence adding the S&C coach gives the right mix
hope things improve for you