De Preist is sitting in a wheel chair at the back of the room as 21-year-old Sean is up on the podium, doing all he can to manage the large orchestra at his fingertips.

NPR: Conductor James DePreist

The average adult in the U.S. and U.K. watches three to four hours of TV daily, Stamatakis says, and many of us also spend our working lives sitting at a desk and commuting behind the wheel of a car.

CNN: Too much TV time may hurt your heart