Coach feeds random balls and the player must hit all of the these balls cross court in between the target cones.
Being comfortable while hitting cross court shots is a necessity to play tennis at a decent level. Players have to execute the shot with consistency to have a back up plan while other things fall down. Cross court direction is safer than down the line (longer distance, lowest net point) and it can put the opponent on the run so players should base their tactics on that solution. Looking at the pros (Nadal, Djokovic, Federer) we can learn that they almost never miss cross court shots because it is a consistent option (they risk more with down the line to win the point).
Indoor courts give players less time and less room. Help them sharpen their split step, shorten their swing and stay calm, and winter becomes a season of real progress.
A tiebreak is a short sprint where every point is worth the same as a break of serve. The players who win them are rarely the ones who hit hardest. Here is how to coach the patterns, habits and scoreboard thinking that win the big points.
Most club players practise the serve on its own and then have no idea what to do with the ball that comes back. Serve plus one is the pattern that turns a good serve into a won point.