What Is A Good Home Treatment For Lower Back Pain?

A friend of mine that lives out of town only 1 and half hour drive anyways he's been having lower back pain for a couple of days now tonight when i was chatting to him on msn i ask him if he had any pain killers he said no and i asked him if he has any money to buy some he said no then i asked him if he had a heating pad and he said no again and i asked him if its any better then it did 2 days ago he said a little and it started when he was sitting down and watching t.v. with his girl friend (its not me) i would like to know is there any home treatment he can do to take away his back pain?