In any office, two people can use the identical chair and desk — yet one walks away at the end of the day feeling stiff and worn out, while the other stands up feeling comfortable. If the chair were the problem, everyone would feel the same. But that's not what happens.
The difference isn't made by the chair. It's made underneath the chair — specifically, by where your feet are.
80% of Your Sitting Posture Is Determined by Pelvic Tilt
Research on sitting posture consistently points to one key variable: pelvic tilt. The angle at which your pelvis tilts forward or backward shapes whether your body settles into its natural curve — or slumps.
- Posterior tilt (pelvis rolling back) → the natural curve flattens, and the position tends to feel less comfortable over time
- Neutral pelvis → the body keeps a natural, relaxed curve, spreading your weight more evenly
The problem? Pelvic angle cannot be maintained by willpower alone. Within minutes, the body slumps into whatever position feels most comfortable. The key lever that controls pelvic angle in real time is your feet.
When Feet Float, the Pelvis Rolls Back
When your desk or chair height doesn't match your body, your feet don't fully contact the floor. Suspended feet press the backs of your thighs into the front edge of the seat, shifting your center of gravity toward the tailbone.
Your body then chooses one of two compensations:
- Cross your legs, tilting the pelvis to one side → asymmetric, uneven weight
- Slide forward and lean against the backrest → the pelvis rolls back
Both postures flatten the natural curve. This is the real reason comfort varies between people sitting in the same chair.
A Supported Foot Position Helps You Sit More Comfortably
Ergonomics research, including work from the Cornell Human Factors and Ergonomics Research Group, has long looked at how foot support relates to sitting comfort. Many people find that having a place to rest their feet makes it easier to hold a relaxed, neutral position for longer and to feel less tired through the day. The posture shifts not through muscle effort, but simply through the presence of a support surface.
Good posture doesn't start with "trying harder to sit up straight." It starts with giving your feet somewhere to rest. This is the core of what ROUMO calls Behavioral Design — letting the environment do the work, rather than relying on willpower.
When Your Legs Feel Right, Your Day Feels Different
You don't need a new chair. You don't need a new desk. You just need to create one place for your feet — within the setup you already have. The ROUMO LC99 is designed with 81 height and angle combinations (5–19cm height, 9 holes front and back) to find the right position for any body type, any desk.
Your chair is only half. The other half starts at your feet.
📚 References
- Hedge, A. Cornell Human Factors and Ergonomics Research Group. ergo.human.cornell.edu
- ISO 9241-5. Ergonomic requirements for office work with visual display terminals — Workstation layout and postural requirements.
- OSHA. Computer Workstations eTool — Good Working Positions (seated comfort and foot support).
Tags: footrest, ergonomic footrest, ROUMO, Dual Rest, ergonomics, sitting comfort, office comfort, behavioral design
This product is not a medical device, and how it feels can vary from person to person.
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