To view this video you need to login.
A simple way of grooving the backhand drop technique is for a feeder to continuously lift the shuttle to the backhand rear court whilst the player hits backhand drop shots.
As you get used to the practice you should aim for quality through the shuttle passing close to the net tape and into the forecourt area.
To create a bit more movement pressure the feeder can play alternate lifts and pushes into the forecourt.