Arm path and release come first
Before you add any weight, the arm has to move correctly. Towel throws and tennis ball releases isolate the whip-and-snap pattern without asking your shoulder to decelerate a heavy implement. Most throwers rush this step and go straight to loaded work, then wonder why their release still looks stiff. Spend two full weeks on unloaded arm-path work before adding a medicine ball, and check your release angle against the measured optimum for throwing events rather than guessing at 45 degrees. A clean unloaded pattern is worth more than a hundred rushed reps under load.

