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.
And a 160-pound person will burn 580 net calories in the same session. A 190-pound person will burn 692 excess calories playing doubles tennis for two hours. A 230-pound person will increase his calorie burn to 836 calories in two hours of tennis. In two hours, a 270-pound doubles tennis player will burn off an extra 980 calories.