Athletes Athletes

Portugal's Cristiano Ronaldo takes a water break during the 2014 World Cup soccer match between Portugal and the U.S. in Manaus, Brazil, on June 22. Siphiwe Sibeko/Reuters/Landov hide caption

toggle caption
Siphiwe Sibeko/Reuters/Landov

Sarah Piampiano holds two energy gels, one with caffeine and one without, as she runs in this year's Ironman World Championship. Murray Carpenter for NPR hide caption

toggle caption
Murray Carpenter for NPR

Caffeine Gives Endurance Athletes A Third And Fourth Wind

  • Download
  • <iframe src="https://www.npr.org/player/embed/165157480/165454188" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Lance Armstrong competes in the Ironman Panama 70.3. triathlon in Panama City, Panama. Arnulfo Franco/AP hide caption

toggle caption
Arnulfo Franco/AP

Triathletes begin the 1,500-meter swim (just under 1 mile) in the Hudson River as part of last year's New York City Triathlon. Two race participants died during this year's swim portion. Dario Cantatore/Getty Images hide caption

toggle caption
Dario Cantatore/Getty Images