As an introduction to the drill, demonstrate each of the overhead serves and explain their differences. Include the pure slice, topspin-slice, topspin, twist, and flat serves, plus the reverse slice, if you're that rare player who can hit it well.
To begin Return and Identify, cycle through every type of serve before going back to one you've already used. If the student misses either the return or the identification, give her additional tries before moving on to the next type. Once she has returned and identified each type of serve at least once, start mixing the types randomly.
Difficulties: Most players find this drill exceptionally interesting and do well at both the returning and identifying tasks. How well they do at identifying doesn't correspond closely with hitting ability, though. An observant and curious intermediate will often identify more successfully than a more advanced player and will be especially intrigued by all of the variety possible in serving. A minority of players will find the identifications very difficult, so always introduce the drill as a tricky one to help prevent frustration.
