As an ergonomics expert, I can provide a comprehensive answer to whether leaning back in your chair is bad or not. The posture you adopt while sitting can have a significant impact on your overall health and comfort, particularly if you spend long hours at a desk.

Firstly, it's important to understand that sitting upright straight, often referred to as a 90-degree angle between the back and the thighs, is not always the best position for everyone. This position can lead to muscle fatigue and discomfort, especially if the chair and desk are not ergonomically designed to support this posture.

Recent studies have suggested that leaning back at an angle of approximately 135 degrees can be beneficial. This posture allows for better distribution of body weight and reduces pressure on the spine and lower back. It can also help to engage the back muscles, which can be beneficial for strengthening the core and reducing the risk of back pain.

However, it's crucial to differentiate between "slouching" and "leaning back." Slouching, where the back is rounded and the pelvis is tilted backward, can lead to poor spinal alignment and increased risk of back pain. On the other hand, leaning back with a straight back and engaged core muscles can be a healthier alternative.

Additionally, the type of chair you use plays a significant role. An ergonomic chair should support the natural curve of your spine, allow for proper leg and arm positioning, and provide adjustable features to accommodate different sitting angles. A chair that encourages a reclined posture should have a backrest that supports the lumbar region and a seat that is tilted forward slightly to promote proper blood circulation.

It's also important to note that no single posture is ideal for all individuals or for all periods of the workday. Variability in posture is essential. Changing your sitting position regularly can help to reduce the risk of developing musculoskeletal problems. This can be achieved by incorporating standing or walking breaks, using a standing desk, or practicing gentle stretches throughout the day.

In conclusion, leaning back in your chair at an angle of around 135 degrees can be beneficial for your back health, provided it is done with a straight back and proper chair support. It's also essential to maintain good posture, take regular breaks, and use an ergonomic chair designed to support a variety of sitting positions.

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Sitting up straight is not the best position for office workers, a study has suggested. ... They told the Radiological Society of North America that the best position in which to sit at your desk is leaning back, at about 135 degrees. Experts said sitting was known to contribute to lower back pain.Nov 28, 2006read more >>