There are a lot of articles in the scientific literature about the importance of exercise. Here is a link to over 70 such articles.

http://convergencesciencereligion.org/search/label/exercise

I don't understand how a 30-minute workout does not compensate for previous sitting???

I wish this was explained!

Makes no sense.

When it comes to arm movement, dentists mostly make small movements. Conductors, on the other hand, spend much of their working time moving their arms very energetically, & they tend to have long lifespans.

I keep my computer monitor at standing eye level (along with the speakers) and put the keyboard and mouse just above the navel. I think it keeps me from just zoning out and slouching.

What a difference between Elliot's off-hand, can hardly be bothered interview style and Julie Burstein!

Bring Back Ms. Burstein!!

what about sitting on an exercise ball (less sedentary than a chair)

Sitting and watching TV, or reading books, or working at a computer terminal, or playing video games are not inherently bad, as long as one isn't constantly munching away on cheap, high carb snacks, and provided one also takes out some time for a bit of quality exercise and fresh air as well.

I always hear that time spent watching tv is bad for your health. But wouldn't time spent sitting and reading be just as bad? I'd be so curious to know. Thanks.