Final answer:
Keeping body parts in natural alignment and using supports to prevent covers from resting on the feet is important for maintaining proper posture and comfort.
Step-by-step explanation:
Keeping body parts in natural alignment is important to ensure proper functioning and prevent strain or injury. In the case of the hand, it should be positioned from the palm backward to the palm forward position. When lying supine, it is important to use supports to prevent covers from resting on the feet. This helps maintain a natural hand position and prevents discomfort.