What do you think? Is the previous video motivation? I highly doubt it. THIS LINK will take you to a CNN article on coaches and bullying players. It is safe to say that knowing the signs of a bully and someone who has been bullied, will help prevent further incidents. The CNN article does a good job of explaining some signs and the video should give you a good visual aid.
Coaching requires a vast amount of knowledge, ranging from physiology, anatomy, psychology and even motivational techniques. When motivating an athlete you must look at the individual, how do they respond to different tactics. Are they extrinsically motivated or intrinsically? What is going on in a person's life that affects their level of competition? Coaches must find creative ways to motivate everyday. It could be with recognition of a specific skill, changing of the activity or letting the players have input. There are many easy tips to keeping students/athletes motivated. There are 21 ways in THIS article.