Unfortunately, this starts off with a really bold statement.

> The toll our relatively new sedentary lifestyle takes on our bodies is clear: For the first time in U.S. history, younger generations are expected to live shorter, unhealthier lives than their parents.

This sounds really biased. Obviously exercise is good for you, but to say its the only factor causing a reduction in our life expectancy is quite a reach.

This makes me doubt their interpretation of the other research presented.