What will your next doubles session actually change?

Before your next doubles session, you will probably do what most committed coaches do. You will think about the players, search through a few familiar activities and try to build a session that keeps everyone involved. You may change a rotation, add a target or choose a new drill because the last session felt too repetitive. Then you will step on court and meet the same problem: the activity runs, but you are not completely convinced it is changing what the players do when a real point...