To run, or not to run - that is the question!

To run, or not to run? 

The only reason I'm digging into this question deeper than simple "Running is good", is attitude of some of my friends and relatives - they believe I'm hurting myself with all this triathlon stuff.

I know what i'm doing, just believe me! 

But as not-hard-nosed person, I'm going to do a research on this topic and to support my point with corkers.

So, pessimistic point of view on running:

1. Running kills your joints because overload.
2. Running causes extra load to your spine.
3. Morning running is bad for your heart
4. Any kind of running is extra load for your heart which leads to bla bla bla....

Lets go one by one and try to figure out.