Back ache

Hi i have been riding a good few years now been on my current bike nearly twelve months but recently started with back ache on the right side in the lumbar region .The only things i have changed in the last 5 months are the saddle and changed to a reverb post

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My best advice is to ensure you stretch thoroughly, before and after rides, however small.
It sounds pathetic and a bit like school PE classes, but it really is crucial.
Ensure that you stretch your lower back and also your hamstrings especially, these are what get tight in Cyclists and cause all sorts of trouble, including back pain.
It will take a while for you to gain flexibility, but it will help your comfort a great deal. Cycling makes demands of your core, back and legs in a restricted range of movement, therefore leading to shortening of the muscles.
I also use a foam roller and do self-massage of my leg muscles using my bodyweight, this helps to further stretch the muscles, and work out knots and tension after rides.
Hope that helps.
Hope it gets better soon!
Felt
Scott