Mark Hamill's training while preparing to play Luke Skywalker in "The Empire Strikes Back" was grueling, and a strict edict from director George Lucas undid some of his hard work.

In an interview for the "Star Wars" website, Hamill said that weeks of training with Olympic fencing champion Bob Anderson went to waste when Lucas disapproved of it.

"We had choreographed stuff where, you know, we did spins around and we did various things ... He didn't want us to ever take both hands off the hilt," Hamill said.

In "Star Wars Featurette: The Birth of the Lightsaber," Lucas said of the lightsaber, "They had a lot of energy in them, so you worked with them as if they were heavy."

Lucas got rid of the two-handed rule when Luke became a more formidable warrior as time went on in order to illustrate how the Jedi become experts at using the weapon.