Hi, Recently i got a defferal because of an old lower back pain i used to suffer from. I thought this problem had gone but after doing alot of running and with 10kg in a bag, i realised theres still a problem. I want to try and strengthen my back and sort it out so ic an re-apply. Is there any excercises that someone might know which might be good for this ? (I have gone to the hospital, physio & chiro and none really found out what was wrong) Thanks for any help!