Time – Shotgun 21 fosters players hitting many more balls in a shorter amount of time than traditional tennis.

Rallies – approximately 40% of the points in traditional tennis are lost on the serve or the return. So basically half the points in tennis are over before they start. For the remaining 60% of the points, the server often starts out at an advantage. In the Shotgun 21 format, an overwhelming large amount of points allow both players to push themselves and each other to get great rallies.

Workout – players get a better workout in a shorter amount of time because the traditional serve is out of the equation.

Injury – an overwhelmingly large percentage of injury in tennis happens because of the traditional serve.