Throw the ball in the air using two hands, move to where the ball is coming down sit down on the floor and catch the ball.
When you have caught the ball throw the ball up in the air and get up ready to catch it.
Look for controlled throws, ideally players shouldn't need to move from where they are stood if they are throwing the ball accurately.
New hitters rarely miss because of their arm. They miss because of their feet. Build a reliable approach, then time it with your setter.
When your hitter gets stuffed, five teammates standing and watching is how you lose the point. Good attack coverage turns a blocked ball into a second swing.
Coaches spend hours correcting arms in serve receive when the real fault is almost always the feet. Fix the movement and the platform fixes itself.