If you have a kid involved in sports, which is likely since there are so many options available now from golf to fast pitch softball to traditional football, you need a video camera. They are great for training or coaching. You can point out mistakes and strengths that cannot be noticed in real time. Plus the kid cannot watch themselves live they need video evidence, especially the hard headed ones! Our child takes fast pitch softball lessons and when working on it home we use video to show her how to improve. It really works if you take the time to do it. You can break down each motion to get rid of bad mechanics or habits.
Of course if you are a coach you can use video for the same purposes. I know football coaches use game film to prepare for each opponent but they could go further and record each practice to get exact details on their own players. Specialty coaches that train on an individual a basis are crazy if they don’t record their training sessions. It would be a tool for the player to get better and also a way to differentiate their service from the completion not to mention a way to create a training dvd to market to the masses. These personal trainers make great money if they know what they are doing by the way. People will pay all kinds of money to help their kids excel.
The NFL has their system set up for each team to be able to download any video they want for an upcoming opponent. In the old days they used to mail the tapes! They have paid employees that break down every aspect of the opposing team’s games. Some of those guys’ sole purpose is to know every single tendency of the adversary’s quarterback in order to defend against him. If NFL teams see the value in video of players then it is obvious how important it could be for your child. They would not spend the money or time unless it paid off. I think it can pay off for a kid wanting to get better at their chosen sport.