[oarabbus_]

>I really don't think running compares in terms of how stressful the sport is on the lungs.

Sounds like words spoken by a person who's never run a competitive 800m race. Maybe if you said swimming just barely edges out running in lung stress... sorry, but this claim is simply comical.

[rscho]

Yeah... Except that if you run at your maximum capacity every day, you will get injured fast.

In swimming, everyday training (actually twice daily) is extremely hard because the length to which you can go without injury is further. Same as for say, cycling.

[oarabbus_]

Running is definitely harder on the joints.

On the lungs? Give me a break.