My son's HS has preseason workouts. We're located just north of Charlotte NC. First they have open field fall workouts. These are run by the seniors on the team and coaches are not allowed to be on the field or direct the workout, by NC HS rules. Then around mid-Nov they go into conditioning and weight lifting. This is allowed to be supervised by the coach. Next they have 8 on 1 workouts where the coach can take eight players on the field and run workouts. Then comes try-outs. Everything but the 8 on 1 is open to all boys that want to play baseball. The coach asks various groups of boys to come to the 8 on 1 workouts. By the time tryouts come around, the coach has a very good feel for who the players are.