You’re well aware that a sedentary lifestyle isn’t exactly great for your health, but did you know that sitting on your tush all day can lead to something called dead butt syndrome? And while the name is pretty funny (come on, try to say it out loud without snickering), the symptoms are anything but. That’s why we chatted to Jacque Crockford, a certified personal trainer from the American Council on Exercise, to get the facts.