Question

Benefits the bowler had with introduction of over arm bowling

Answer 1

a. The mere rotation of the shoulder (instead of throwing) to impart velocity to the ball eased the bowler's effort to deliver the ball.
b. The rotation of the arm through an arc to release the ball above the shoulder joint prevented any sort of shoulder injury.
c. It enabled pacers/fast bowlers to increase the speed of the ball with a faster run up or a sling action delivery
d. For spinners, it only meant a subtle contraction of wrist of finger muscles, devoid of any physical exhaustion.
e. Finally, overarm bowling became an important part of a bowlers skill set, which contributed to the latter's all flexibility.