"Most people are sitting six to 13 hours a day. This immobility causes the illnesses we have come to recognize as modern disorders, like diabetes, obesity, cancers, heart conditions, and loss in blood volume," she said.
While those diseases may take years to develop, the pain from sitting all day is immediately felt after getting up. Here's why everything hurts after a day spent chained to your chair.
Your muscles are wasting away
When you sit all day, you know what your glutes and calves are doing? Pretty much nothing -- except slowly wasting away. This could make for a sore, wobbly walk home, when your legs finally start holding you up again.
"It's not the number of hours sat that's important, it's how many uninterrupted hours of sitting that matters," said Vernikos. When conducting a study on people lying in bed 24 hours a day, she found that standing up every half hour was enough to prevent the harmful effects of an otherwise immobile lifestyle.