MLB star Bryce Harper posted a picture on his Instagram story of his back during a "cupping" session.
Cupping is a Chinese medicine therapy in which heated glass cups are applied to the skin along the meridians of the body, creating suction as a way of stimulating the flow of energy.
In addition to "stimulating the flow of energy" it also stimulates the gag reflex. It is tough to look at. But if he drops 50 homeruns and drives in 150 RBIs then keep cupping.