[Yarok]

hi
cos imbalance of your posture gave strain on the lower back that's why you could have jammed lower back.
you should find a physio with experience in a gym or personal trainer with clinical knowledge, manual therapist,sport therapist etc.
i noticed few ozziz on the forum, im a fan of alophysio, check database for his contacts.
all the best
PS i would reccomend high impact training lots of free weights

thanks