Sitting for hours on a regular basis can be bad for your body and brain. A new study suggests that keeping your brain engaged helps counteract some of the harms of sedentary behavior. Engagement means activities such as knitting or solving a puzzle, instead of mindlessly scrolling or passively watching a screen. Scientists at the Karolinska Institute in Stockholm surveyed 20,811 Swedish adults, mostly women between the ages of 35 and 64, about their weekly physical activity and how much daily