Throw the ball in the air using two hands, move to where the ball is coming down, lay down on the floor and catch the ball.
When you have caught the ball, throw it up in the air, get up and catch it (when laying down be aware as to not bang head on the floor).
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.