I just went to a new baseball facility with some of the kids from my team(I coach my sons baseball team) and they have a simulator that looks like a pitcher throwing a ball. It starts with him in a windup and when the hand comes overhead a ball shoots out of a hole throwing at 100mph--holy crap that was fast and the impact it would make on the back stop was unreal. My nephew tried it and hit 3 of them. I may try it next time just to say I did it but wow it was fast. My son went into the 55 mph cage and hit almost all of them(he switch hits and hit them both ways) the fastest pitcher in his league is either 10 or 11 and throws around 55mph-- so I let him try the 65mph and he hit 4 out of 10 and my son just turned 9 so I was very proud of him.