The seat height is correctly adjusted when your thigh forms a line sloping down to the knee. The angle between your back and thigh should be 110-120 degrees (open seat angle).
Important:
Your back should always be in contact with the backrest.
Frequent errors:
Seat height too high - you lose contact with the floor and your muscles tense up.
Active sitting will help your concentration and prevent poor posture due to static sitting. Set the counter-pressure of the backrest to your weight so that when you are sitting upright you neither topple backwards nor have to apply too much pressure when you lean against it – the backrest must give you pleasant support with the counter-pressure set correctly.
With your pelvis back up against the backrest, you should be able to fit at least three fingers between the hollow of your knee and the front edge of the seat.
Frequent errors:
Too much seat depth - you automatically slide forward and lose contact with the backrest.
Not enough seat depth - insufficient support area, leading to muscle tension in the legs.
Your shoulders should be more or less horizontal while your forearms lie on the armrests. Your shoulder and neck muscles should be as relaxed as possible.
Frequent errors:
Armrests too high - you cramp up and your muscles can even become shorter over time.
Armrests loo low - your arms pull your torso down, resulting in a hunched back and a stretched cervical spine.
Your shoulders should be more or less horizontal while your forearms lie on the armrests. Your shoulder and neck muscles should be relaxed as much as possible.
Frequent errors:
Armrests too high - you cramp up and your muscles can even become shorter over time.
Armrests loo low - your arms pull your torso down, resulting in a hunched back and a stretched cervical spine.
Your shoulders should be more or less horizontal while your forearms lie on the armrests. Your shoulder and neck muscles should be relaxed as much as possible.
Frequent errors:
Armrests too high - you cramp up and your muscles can even become shorter over time.
Armrests loo low - your arms pull your torso down, resulting in a hunched back and a stretched cervical spine.