Extended sitting has become a defining feature of modern work. Office professionals, developers, and remote workers often remain seated for hours at a time. While sitting may appear passive, the body continuously manages pressure, posture, and heat during prolonged desk work. When sitting for long periods, body weight is supported by limited contact areas, commonly around the hips and lower back. Over time, this can contribute to a general sense of discomfort or fatigue. In addition, reduced airflow and limited movement may affect how comfortable the body feels throughout the workday. Beyond physical sensations, prolonged sitting can influence mental focus. Frequent posture adjustments and restlessness often stem from discomfort rather than lack of concentration. This highlights why sitting comfort is increasingly viewed as part of everyday productivity. Addressing prolonged sitting does not require dramatic lifestyle changes. Many people focus on simple strategies such as standing periodically, adjusting desk height, or improving seating support. Increasingly, attention has turned to how seating surfaces distribute weight and allow airflow. Design approaches that emphasize balanced support—rather than extreme softness—aim to let pressure shift naturally as the body makes small movements. Air-responsive seating concepts are one example of this thinking, using internal air movement to adapt to changes in posture. This philosophy of balance and everyday usability is reflected in the design thinking behind AJ air cushion, which focuses on adaptive support and breathability for long periods of sitting—without positioning the product as a medical solution. Long sitting may be unavoidable, but comfort can be intentionally designed to better align with modern work habits.