There has been a lot of news about the use of acupuncture by Olympic Athletes. The marks you see on this swimmer are from cupping therapy. The most frequently asked question is if it hurts. The answer is no. Most of my patients love cupping and use it to release stubborn muscle knots and tension.

  http://www.dailymail.co.uk/news/article-1041370/The-price-Gold-Chinese-athletes-left-huge-spots-cupping-therapy-quest-Olympic-glory.html