Originally Posted by sobotkg
Definitely get to water. Even if there are no fish. The tension of the water on the line changes the resistance experienced by the rod.
I don't like grass because it causes wear and micro cuts on the fly line, but with a used fly line and a "grass leader," one can simulate the "feel" of water resistance. Make up a few for teaching the roll cast.
"Roll/Spey grass leader"
on Google and click on the first hit. You can modify the leader to make it shorter or longer.