Here is a short documentary about players trying to make the Gary RailCats, a team which plays in the American Association.
It shows the challenges which players have when trying to make a team through an open tryout camp versus being signed directly as a result of a recommendation or being scouted by the team. You also get to hear from Greg, manager of the RailCats, and he gives some insights on what is being sought and how he thinks as a professional baseball field manager regarding signing new players.
Become aware of upcoming tryouts by joining the notification service here: Independent Minor League Pro Baseball Tryouts
If you need some help increasing your 60 yard dash speed times, arm velocity, vertical leap ability, hitting power or improve your muscle mass for any professional baseball tryout (or private workout) then here are some resources to help you: Resources for improving your chances at any pro baseball tryouts