I wish there were healing dummies.
Next to the dps target dummies in a city you'd have the same basic thing, but representing a player - a tank.
The first one would have its health drop at a slow, steady pace. Practice your HoTs and efficient heals.
The second would have the same slow decline, but with regular damage spikes, dropping the health pool way down to 10% or so. Practice your emergency heals.
The third would be unpredictable. Periods of no/slight damage, periods of big, heavy hits, and everything in between. Practice not crapping yourself.
What are your thoughts on this?