Stepping on someones back when they have back pain can help relieve the pain and tense muscles.
It works kind of like a massage when walking on someones back and I've done it quite a bit when I was a kid and walked my my dads and grandpas back and it made their backs feel better when they had back pain.
Now I have a friend walk on my back when I'm experiencing back pain and it does help me too by relieving tense muscles and when my back gets walked on the back feels much better afterwards and the pain goes away.