Their practice is a well prepared routine. For those who attended the ABCA Convention of San Diego a few years ago or the German Clinic las year, it's pretty much the same routine that Charlie explained in his topics there.
Seeing live though brings a different perspective.
Halfway blocks, doubles, triples... off a pitching machine shooting sliders.
In another cage, Nestor is shooting balls for catchers to receive. Some of these balls reach 102 MPH. And they handle it pretty well.