Get with your youth, middle school, freshman and JV coaches and make this a priority in their teaching, so that when they are at the varsity level they already have that mindset.
"A player's ability to rebound is inversely proportional to the distance between where he was born and the nearest railroad tracks. The greater distance you live from the poor side of the railroad tracks, the less likely that you will be a good rebounder." - Pete Carril
Rebounding is one of the most important aspects of winning basketball games. Offensive rebounding gives your team extra chances and free throw opportunities and frustrates the defense.
Defensive rebounding is a key part of good defense in general, limiting the offense to just one shot. A good thought is "one shot and out".
Defensive rebounding combined with a quick outlet pass can be an effective offensive weapon, getting the transition game and fast break going, for a layup at the other end.