Electric spider, massage large muscles.

The old man was very happy and scratched his back.

Throw the ball in the back.

Scraping the board, everyone in China knows how to do it.

I comb my hair with my fingernails, which is absolutely environmentally friendly.

Your own finger, the cheapest massage tool.

Wait a minute. . . There are too many examples! The night market is piled on the roadside.