Six Skills, Blocking

By way of review, my concept of volleyball skills as a NON-EXPERT is:

• Exchanges (serving and initial passing)
• Offense (setting and attacking)
• Defense (digging and blocking)

Today's video from the Art of Coaching Volleyball series (some of the elite college volleyball coaches) reviews blocking. One coach says that the least taught skills are serving and blocking. To me, Melrose's best skill through the years has been blocking. 

I watch every video to see if it seems easily understandable (setting a low bar for myself).