Sitting in the car, sitting all day at work, and sitting on the sofa in front of the TV...

   It's as bad for us as smoking according to a new Mayo Clinic study.

    It causes obesity, high blood pressure, high cholesterol, heart disease, cancer...and back pain.

   One expert saying for every hour we sit, we cut 22 minutes off our lifespan. 

   Bing Howenstein of Backjoy Orthotics says exercise, especially core strengthening will help.

   Like mom said, sit up straight!

   One big thing we can do is improve our posture.

   Keep legs at a 90 degree angle and hips upright.

   Keep your head and shoulders back, and move that computer screen higher so you're looking straight at it.

    Watch your posture while on the phone - slumping over adds strain on the back.

   Howenstein also advises women to kick off the heels.

    Click here for more from

Photo credit: Joe Raedle / 2012 Getty Images