You'd think that the people most prone to back pain would be professional contortionists and those playing contact sports. While you can certainly suffer from acute injuries to your lower back from moving the wrong way, it's much more common to suffer from back pain from doing something that seems more harmless than a dead bug: Sitting. People who sit for long periods of time are prone to back pain because of the strain of being in a fixed, slumped position (which is why you need to maintain good posture). Sitting increases pressure in the discs, even more so than standing. Sitting also leaves back muscles weaker than watered-down coffee, since sitters don't actively use and engage those muscles much throughout the day - it's what's called disuse atrophy (in other words, lose it if you don't use it). Standing with poor posture also puts your back at risk, since belly muscles are lax and your spine bears the brunt of any unexpected or awkward movement.
Find out more about this book:You: Being Beautiful - The Owner's Manual to Inner and Outer Beauty