One of your favorite activities may actually be killing you.
Our entire modern world is constructed to keep you sitting down. When we drive, we sit. When we work at an office, we sit. When we watch TV, well, you get the picture.
"American Sniper," Clint Eastwood's film about Navy SEAL marksman Chris Kyle, stunned just about everyone by earning $105 million over its first weekend in wide release -- an unprecedented haul for a downbeat, R-rated drama releas