Explain the following: (i) Round-arm service (ii) Tennis service

(i) Round-arm service: the server stands facing the net, swings the arm in a wide circle from the side, and hits the ball with the heel of the hand or the fist. (ii) Tennis service: the server stands facing the net, tosses the ball up with one hand and hits it with the other hand at full stretch above the head, as in a tennis serve; it is a powerful service.