As soon as he walked out to the pool, many were wondering why he had dark red and purple bruise-like marks on his back and shoulder?
It turns out the bruises are caused by a therapy called "cupping." Many athletes believe cupping helps them heal faster and relieves tension in their muscles. Suction cups are used to pull the skin up and away from the muscles. The suction only lasts a few minutes but it instantly creates a bruise, much like a hickey would.