Sitting in Excess is Dangerous to Our Health. Sitting for long periods has been linked to an increased risk of chronic diseases, including heart disease & type 2 diabetes. Sitting 6+ hours a day can increase risk of death by up to 40%. Break-up prolonged sitting with movement: you can then, optimize health, lower your risk & improve your longevity. Here is a tip that can help you, set the timer /alarm your phone to go off at every 30mins. Once it beeps, get up and stretch your legs , move around for few seconds if you can..