The American T'ai Chi Associates recommends looking for a school that adheres to the original principles of the martial art it offers, rather than one that dilutes them by, say, pairing jujitsu with kickboxing: The purer the teaching, the more your child stands to gain.
The mean calories burned per minute of tennis, based on the list of 5 activities, shown below, for an average male, weighing 190 pounds (86 kg) is 9 Calories per minute. The average per minute for an average female, weighing 163 pounds (74 kg) is 7 Calories per minute.
Fastest recorded tennis serves. This article lists the fastest recorded tennis serves in the men's and women's games. This list may not be historically complete. A serve by Bill Tilden in 1931 was timed at 182.2 mph (293.3 km/h), but this is not listed because of questionable technological accuracy.