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Your son will have a great time. He will get the opportunity to meet some of the best players in the country, both high school and college. Our experience was that typically the workouts had 25 players or less present,including pitchers. One workout only had 14 players. Each workout was a little different, but covered the same basics, probably similar to most showcases.
The players will warm up with a coach leading the drills, i.e. stretching, light running, etc.
Times will be taken on 60 yard dashes.
Typically pitchers threw first. Some workouts had pitchers throw in the bull pen only, while others had pitchers throwing to live hitters. Catchers will catch the pitchers both in the bull pen and if they throw live. Catchers also will be timed on their throws. Infielders will take infield with a coach and work through the typical drills. Hitters will get an opportunity to hit with the coaches throwing.(Typical BP, except there will be a number of the club's "upper management" present watching and filming every move your son makes.)
"Upper Mgmt" will talk to the players, oftentimes one-on-one. Some may even introduce themselves and talk to you.
Bottom Line: Enjoy it. Getting an opportunity to throw & hit in a big league park is exciting. As a parent, just watching your son throw and hit in a big league park is a thrill, no matter what happens in the draft. Good luck to you.