Final answer:
The document that may be presented in a lawsuit to release a fitness professional from liability related to a client's injury is the Waiver and Release Form.
Step-by-step explanation:
The document that may be presented in a lawsuit to release a fitness professional from liability related to a client's injury is 2) Waiver and Release Form. This form is a legal document that the client signs before participating in any fitness activities or workouts. By signing this form, the client acknowledges the risks involved and agrees to release the fitness professional from any liability for injuries that may occur.