Answer:
Musculoskeletal.
Step-by-step explanation:
The client's discomfort with stiff and uncomfortable legs indicates a problem with the musculoskeletal system. This system includes the bones, muscles, tendons, and ligaments that work together to allow movement and support for the body. Issues with this system can lead to conditions such as arthritis, muscle strains or sprains, and nerve damage. A healthcare professional would need to conduct further evaluation and examination to determine the specific cause of the client's discomfort.