I am creating a continuing education program and certification for strength and conditioning coaches and rehabilitation professionals on training and rehab of the throwing athlete. I would like to show video analysis of voiceover style videos featuring professional pitchers to demonstrate proper technique. Is this something I can do legally? Not sure if it would be considered fair use.
You should get permission from the copyright holder of the video - could be the videographer or their employer, or ESPN... In my opinion what you are describing would not pass a fair use test. You might also need permission from the athlete in the video, depending on state law.