Spielberg said Ford was perfect for the role after seeing him in "The Empire Strikes Back"; Kanzanjian said Ford had always been considered but not cast because he was already a well-known actor. Lucas was concerned about seeming reliant on Ford by casting him in another film after "Star Wars". He also did not think Ford would commit to three films, as he was reluctant to do so for "Star Wars". However, Ford thought it would be a fun project and agreed to the deal. He negotiated a seven-figure salary, a percentage of the gross profits, and the option to re-write his dialogue. Ford undertook extensive exercise to enhance his physique and trained for several weeks under stunt coordinator Glenn Randall to use a bullwhip; Lucas had always envisioned the character wielding a whip. He had to rehabilitate his wrist to compensate for an old injury. Ford saw the character as an academic first and an adventurer second.