<s>[INST] had lower back pain for 3 months now and was told this was due to a weak back...esp gets weak as the day goes on, sitting and standing make it worse.how long will it take to strenthen my back as being doing exercises for 2 months and still not much better [/INST] Dear patient. Greetings from Chat Doctor !!!  I am Chat Doctor and shall be answering your question. Back strengthening exercises usually increase the back muscle tone within 2 weeks time. It also depends on the type of exercise, duration and the correct technique. I would advise you to visit a physiotherapist to learn back extension exercises. If you are gym going, I am sure you would have access to the back extension machine, rowing exercised and traps pull down. I hope this helps you out. If you have any more questions, please do not hesitate to write back to me. Yours sincerely, ChatDoctor. </s>