Omega 3

http://www.mendosa.com/blog/?p=1616#more-1616
The Journal of Nutrition shows a surprising connection between omega 3 and physical activity. An observational study of 344 healthy adults living in and around Pittsburgh, Pennsylvania, found that those people who had regular physical activity had more omega 3 in their blood — and were therefore at less of a risk of heart disease — than those who didn’t exercise.

Omega 3 is good for the brain and heart, but where did it come from? do we produce it or release it when we walk or exercise? Or do people with more Omega 3 just exercise more because the was to, or are they health nuts, taking O3 and exercising?  Until that is answered what does this mean?