Gretchen Reynolds explains how exercise affects the body in distinct ways and provides the tools readers need to achieve their fitness goals - whether that's a faster 5K or staying trim.
Which is caused by the bad cultural ideas in the first place. Ideally, people should almost never sit (on the chairs at least, yogic sitting postures are Ok once mastered). Maintaining the right posture while standing for whole days is hardly possible for most of the people too. People should mostly lay while using computers + walk for at least an hour + have about 20 minutes (see the "The First 20 Minutes" book by Gretchen Reynolds for scientific references) of high-intensity exercising and there will be no back pain. Sitting is what killing us. Whenever I don't have to go to the office I do my coding laying on the floor an feel a way better. Sadly, I've never seen an office where you would not be meant to sit.
If you're interested in fitness and exercise, read "The First 20 Minutes" by Gretchen Reynolds (http://www.amazon.com/The-First-20-Minutes-Surprising/dp/159...). It's somewhat a review of the current state of scientific thought in exercise (tons of studies are cited throughout the book)