What are the red circles on athletes and how do they affect their performance?

The red circles on athletes are called kinesio tape, which is a type of elastic therapeutic tape. It is used to provide support and stability to muscles and joints without restricting movement. Kinesio tape can help improve blood flow, reduce pain, and enhance proprioception, which is the body's awareness of its position in space. Overall, kinesio tape can help athletes perform better by providing physical and psychological benefits.