I don’t know if you have seen this video or not, but if you haven’t you need to. If it wasn’t so frightening it would be funny.
After an early round win by Raphael Nadal at the U.S. Open in New York, he appeared at a post conference interview room to discuss the match. After the English interview, he began to address the Spanish media when he began grimacing. Nadal slowly sank into his chair and eventually ended up under the interview desk. People in media thought that he may have had a stroke, when in fact; he was experiencing severe cramping in his left leg when he hit the deck.
Nadal later laughed it off and told everyone that he alright. I have had cramps from tennis before and I can tell you that it is no laughing matter.
Check out the video at: http://www.mirror.co.uk/sport/more-sport/tennis/2011/09/05/rafal-nadal-collapses-with-cramp-at-us-open-press-conference-video-115875-23397531/