Skin brushing is where you use a natural bristle brush which you can buy at health food stores here and I presume elsewhere too. You brush the body with strokes towards the heart eg up arms and legs. The abdomen you brush in a clock wise direction. From memory you avoid the face and breasts. There are some threads in the forum on this topic if you do a search (sorry I don't know how to do links).

It is excellent for exfoliating dead skin cells, for the circulation and for the lymphatic system. People have mentioned it is good for firming up the skin and helping get rid of cellulite.

I hope that information helps explain the practice.