There are some things on the office chair that can be really annoying and they can pose some problems for you and you need to solve them. Office chairs get worn out for two reasons because the pneumatic lift is worn out and can no longer carry the weight. The only answer is to replace the bad lift and you need to contact the chair supplier in order to get a replacement.
The second reason this happens is that the height adjustment level is damaged as a result the gas lift is set to release the weight applied and makes it to sink. You may turn your chair and see if the lever is misaligned. You need the lever to be pressed back into positon.
In case the chair is many years old you may have to replace it where the parts are not available or the condition of the chair is bad. When your office chair is damaged it can be really depressing when you cannot work out.
The creaks generally have two sources. First is any metal contact where the back attaches to the chair seat. There can be other usual cause and that is loosening of the fixes either in the back or the mechanism to the seat for any big fixings and tighten them up. You need to know about The Bear Knows as it is the finest in the market.