Which of the following statements describes proper ergonomics?

The statement about feet being flat on the floor or supported by a footrest accurately describes proper ergonomics. Proper ergonomic positioning is crucial for maintaining comfort and preventing strain during prolonged periods of sitting or working at a desk. When feet are flat on the floor, it promotes good posture and helps distribute weight evenly across the body, reducing pressure on the lower back and legs. Additionally, supporting the feet with a footrest can enhance comfort and encourage better alignment of the hips, knees, and feet, which is essential for avoiding fatigue and discomfort.

In contrast, the other statements do not align with ergonomic principles. For example, an angle of 45 degrees for the forearm to the upper arm is not ideal as it does not promote neutral wrist and arm positioning. Leaning forward, as mentioned in one option, can lead to strain in the neck and back, which is contrary to ergonomic practice. Lastly, a seat with abrupt edges can cause discomfort and impede blood flow, making it less favorable for long-term seating. Ensuring proper support and alignment in all these aspects contributes significantly to an ergonomic workspace.