Originally Posted by Belz...
Because, just off the top of my head, you're recommending not doing any of the following:
Running (it's high impact, very detrimental to one's joints and has a risk of chemical dependency)
Rugby and Gridiron, in fact, any contact sport.
Intercontinental travel - Jetlag is terrible for you. As is working nights, or irregular shifts.
And a million other things.
If you decide that you should not do things solely on the basis of their possible negative effects without ever looking at the potential positive effects then you're going to spend a lot of time sitting in an empty room reading a book (but making sure, in advance, that the paper it's printed on isn't sharp enough to cut you)