Hold onto pullup bars or fitness rings using your fingers. This will help build better grip strength and will help prevent calluses from your palm slipping down the bar. [stronglifts.com]
People who'd averaged at least 12 hours a day sitting were 63% likelier to develop dementia than those who'd spent less than 10 hours daily in a chair. Furthermore, exercise didn't seem to change those odds, since among people who sat for 10 hours or more daily, those who worked out were as prone to dementia as those who exercised very little. [health.harvard.edu]