Modern sofa's just like in the picture above, are too deep for most people. For design purposes, lounge suites are designed with standard seat depths of 53/54 cm. When seats are too deep, people will always sprawl. This will result in a bulging back and will make getting up and shifting position more diffi cult.
Note: Ensure that your body properly fi ts the lower back support of the chair. When it is possible to slide a flattened hand between the inside of the hollow of your knee (upper side off the calf) and the seat, the seat depth is correct.