Yes, D-1 experience. My point is that normally, unless you have the kids for at least a few hours per day several days per week, very little time should be used for anything other than skill acquistion and situation awareness. Within that context, you can add drills that work on speed and endurance. But to take a few days working on a CF style accel/speed program combined with a weight program, you’ll end up with a Velocity type program that spends an inadequate amount of time on skills and situations.
Again, speed and power are great, but this isn’t football…the time necessary to improve speed and power to any significant degree can easily cut into the time needed to build, refine and maintain skill. And for a 10y.o., skill and situational awareness development are much more important.
Furthermore, and Charlie may correct me here, you can take a 15-16y.o. and bring him up to95% of his potential speed and power within a year to two, but it takes many, many years to fully develop top tier baseball skills. So for any athletes under the age of 15, I would suggest that acceleration work be built into base running drills, and power development be limited to swinging weighted bats and “home run derby” practices. They can hit the gym later.