In this video, we clarify the two types of underspin: 1- the arcing underspin that will brake or checkup and 2- the drive underspin that will skid on the court and stay low (generally seen as a return of serve shot). It is important to have a good understanding of the different spins that are used in the game so that you can move accordingly.
Reading Ball Spin Video: https://youtu.be/j_bHlScZzL8
Tony Roig 
In2Pickle Player Development
Tony@In2Pickle.com
Visit us at www.In2Pickle.com