If while maintaining a normal sitting position one's feet do not rest on the ground, footrests can yet provide for a healthy working posture.
The adjustable range, the angle and a wear-resistant support surface are important aspects in this regard.
In addition, a footrest is sometimes used as a step-up aid when one works on a high desk chair, e.g. at a reception desk.
Basic 950 is a basic foot rest to support your feet.