These are ideas, not a program. I wrapped each clip so you know what to look for. If the video uses a cage or a fancy board, the note underneath is how you do it in the grass for nothing.
Feet in concrete
Watch the arm path, not the feet. Arm up when the front foot would land. Hit each other in the chest. You’re teaching him to throw through the target without rushing the lower half.
In the yard. Two gloves, any ball, the backyard. Plant both feet and don’t let him step. If he starts hopping, you’re done with this one and you move back.
Glove knee down
This clip is a pitching gym. Steal the knee. Glove-side knee on the ground keeps the arm slot honest and the front side closed. We are not turning catch into a lesson on spin.
In the yard. Grass or driveway. Ten throws, then stand up. If the front shoulder flies open, put him back on the knee.
Move back
This is the stretching-out phase. Don’t put a fake ceiling on the distance. If the arm feels good, throw until the distance starts to fall off. Long toss is still the only thing I’ve seen actually build an arm.
In the yard. A street, a park, a field. Walk it out. No radar required. When he can’t hold the distance, that’s the max for tonight — not a failure.
Come in — keep it loud
The pull-down is where velo is trained — not the long hop at 250 feet. Watch how they keep arm speed up as they come in. That’s the point. A lazy toss on the way in wastes the whole session.
In the yard. Once he’s tired, walk in three steps at a time and keep throwing hard. Driveway is enough. Stop when the arm isn’t loose anymore.
More on this tool is in Arm strength is the easiest tool a coach sees.