Here's a sample answer

Dear Sir or Madam,

I am writing this letter to express my concerns about the quality of the working conditions in our office due to which I have started to suffer from major health issues including severe back pain and neck stiffness. Since I have to sit in my broken chair for long hours, and I do not have the opportunity to move around during work hours, I had started to experience pain in my lower back 2 weeks ago. I went to consult my physician and he advised me to get an x-ray done. The reports were shocking for me & my family as they indicated that my backbone has developed gaps due to improper seating posture.

The prime reason which I can gauge here is that the chairs which have been provided by the company for the employees are not of good quality since they do not recline and have very stiff seats with no neck support. Moreover, a lot of seats have broken armrests which make the sitting experience more uncomfortable especially during long working hours. Besides, there are no arrangements for the employees to engage in light exercises before/during/after their work hours so that they can keep themselves fit.

I would really appreciate it if you could talk to the management and resolve this issue for everyone at the office. First and foremost, the chairs need to be replaced by good quality ones which not only have excellent cushioning but are also durable & are appropriate for extended sitting hours. Also, if possible, please arrange light exercise sessions such as 5-min-mid-day Yoga or a regular health talk/consultation from a medical practitioner who can monitor the employee's health and suggest them change in lifestyle accordingly.

I hope this is taken as a matter of urgency since I do not wish to see my other colleagues suffer just like I am.

Yours faithfully,
Yuvrajh Singh