This may occur if: 1  You have a sudden drop in blood pressure. 2  Your body does not have enough water (is dehydrated) because of vomiting, diarrhea, fever, and other conditions. 3  You get up too quickly after sitting or lying down (this is more common in older people).
Wimbledon 2015: Rafael Nadalâs coach says itâs good to talk during play. Toni Nadal feels that coaches are getting a rough deal. Toni Nadal, the coach and uncle of Rafael Nadal, believes it is impossible for a coach not to encourage and communicate generally with a player during a match.
Nadal, who has coached his nephew to 14 grand slam titles, does not expect the rules to change because the tennisauthorities rarely modernise the regulations. The 54-year-old also said it is natural for coaches to give encouragement on the sidelines. âYou pay a coach to watch the game. Itâs unbelievable that all the other people [in the stadium] can say what they want and the coach can say nothing. Itâs unbelievable. You pay a coach to go all the way to Australia, then all the crowd can say what they want and the coach has to sit four hours silent.