
I recently found on the United States Tennis Association site a chart on the top 10 calorie burning activities. In addition, it was almost one of the only activities that almost met all the criteria on the chart, offering cardio burning, resistance benefits, weight baring benefits, and works the upper and lower body.
Racquetball is a great high energy sport that mirrors the movements of tennis. Most workout facilities have racquetball courts for rent, and the sport makes a great indoor twist on an outdoor favorite.