A prefix is a series of letters, or a word, that is added to the  beginning of a word and changes the meaning. For example, in the  word midnight, mid is the prefix.
The more vigorous an activity, however, the more calories youâll burn. Changes in body weight are related to both the duration and intensity of play. Playing singles tennis at average intensity expends 300-600 kcal/h, while high intensity tennis training expends 450-900 kcal/h. Diabetes. The incidence of diabetes worldwide of persons aged 20 or above in 1995 was 4% (approx. 135 million), a figure that will increase to approx. 5.4% (300 million people) by 2025.
A tennis match has sets, and sets have games, and games have points. A player wins a match by winning the majority of sets-usually two out of three for women, and three out â¦ of five for men. . A set is won when the player wins 6 games AND the opposing player has won 4 or fewer games. If the score is 6 games to 5, then the players play one more game.