Student or Learner
Does "all that sitting" mean "such a long time of sitting" or "just such sitting"?
22)If idling away in front of a TV is your favorite daily hobby, it may lead you to an early death. Thatís what Australian researchers found after tracking nearly 9,000 people for an average of six years. Regardless of whether or not they were overweight, subjects who watched television for more than four hours daily had a 46 percent higher risk of premature death, compared with subjects who channelsurfed for less than two hours a day. ďTelevision itself isnít the problem,Ē says study author David Dunstan. Instead, the danger comes from all that sitting, which takes the place of activity-including even the lightest kind that naturally occurs when you are not glued to the tube. ď
The large number of hours spent sitting.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.