It seems to me that removing chair and ball questions depends on the site’s definition of fitness. If the site recognizes:
- Health-Related Physical Fitness
- Physiological Fitness
- Metabolic Fitness
to be part of its definition of fitness, then yes, questions of how one sits and how long one sits at a time without muscle movement have significant effects on one’s fitness.
An exercise ball question that was closed could have been as valuable (if not more valuable) to users who sit at their computer than many of the gym and exercise questions as recent research is showing that exercise does not overcome the disadvantages of prolonged sitting.
According the British Journal of Sports Medicine, “prolonged bouts of sitting time and lack of whole-body muscular movement are strongly associated with obesity, abnormal glucose metabolism, diabetes, metabolic syndrome, cardiovascular disease (CVD) risk and cancer, as well as total mortality independent of moderate to vigorous-intensity physical activity.”
Questions about exercise balls used as a chair and ergonomic chairs are also valuable to one’s musculo-skeletal fitness including posture and flexibility.
However, if the site defines fitness as limited to skill-related physical fitness, then no, chairs and balls as desk chairs would not involve skill or meet that definition of fitness.