Running through the ladders with one foot in each hole. Lift knees so that thighs are parallel to the floor.
Arms should be at a 90 degree angle and elbows are going backwards and forwards. Chest up and core is kept stable.
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.