Healthy Sitting

Healthy Sitting


It is simple for anyone to achieve a healthy sitting posture with a well-designed and correctly adjusted operator or task chair.

Ideally the chair size should be chosen to suit the user; which is one of the reasons why we sell so many different ranges. On our chairs all the controls are easy to reach, but it is just as important that the other elements of a workstation are suitable and correctly positioned for the task that is to be undertaken.

The chair must be close to the desk to avoid the need for the operator to lean forward for long periods of time and the desk height must be level with their elbows. The seat height must be set so that the operators hips are slightly higher than the knees, whilst their feet are flat on the floor.

If this cannot be achieved, because the desk is too high, then a footrest should be used. The top of the computer screen should be positioned at eye level.

The key to healthy sitting is to maintain a natural, “S” shaped spinal curve. This will minimise uneven compression of the spinal discs and muscular strain, whilst improving respiration and circulation. The operator should sit back into the chair thereby maintaining contact with the orthopaedically contoured backrest. The height of the backrest should be adjusted so that the lumbar support is positioned adjacent to the inward curve of the lower back.

The provision of a forward tilting seat can also be helpful as it rotates the pelvis forward thereby naturally encouraging the healthy “S” shape curve.

All operator and task chairs have the facility to recline the backrest. This adjustment should be used sparingly as it changes the angle between the seat and back and could result in the pelvis rotating backwards and loss of the “S” shaped spinal curve position. The choice of a synchro mechanism will minimise this effect since the seat moves along with the back to maintain good posture.

Guide to Chair Mechanisms


The chairs we supply are fitted with one of the following heavy duty, precision engineered mechanisms. Where indicated they also have a seat slider fitted as standard or available as an option.


This mechanism has lever operated back angle adjustment that can be locked in any position or left to follow the user’s movements in dynamic free float mode.


Operator Plus

Similar to the Operator mechanism but with additional, lever activated, seat tilt adjustment. Where indicated, most include tension control to adjust for different user weights.


Operator Synchro

With this mechanism the back and seat recline together in a fixed 2:1 ratio. They can be locked in position or left to follow the user’s movements in dynamic, free float mode. They have adjustable tension control.


Knee Tilt

The lever operated Knee Tilt mechanism has a forward pivot point for reduced knee lift and a superior ride quality. It has a tension adjustable free float mode or it can be locked in any of 5 set positions.


Synchro Knee Tilt

This mechanism synchronises the back and seat in a 2:1 ratio with a forward pivot point. It has a tension adjustable free float mode or it can be locked in any of 5 set positions.


Synchro Plus

This mechanism combines the superior ride quality of a synchronised mechanism with the breadth of adjustability of an Operator Plus mechanism. The back angle can be set independently of the synchronised seat and back function.


Seat Slider

Where fitted, a seat slider facilitates horizontal seat adjustment. This is ideal for extra leg support or where a chair might have multiple users with different seat depth requirements.


Inflatable Lumbar Supports

Chairs fitted with an integrated, inflatable lumbar support and ratchet back height adjustment allows the user to precisely locate and adjust the degree of lumbar support as required. On some chairs the inflatable lumbar is standard and available as an option on the other ranges where indicated.


Gas Lifts

All of our swivel chairs are fitted with a gas lift for easy height adjustment. Most of our chairs are suitable for people up to 150kg in weight. 

We have more durable and robust gas lifts fitted to several of our chairs which are suitable for people up to 200kgs in weight.