Adaptation

Noun; the process of change by which an organism or species becomes better suited to its environment.  

Humans are the most adaptable species on the planet. The cost of this is that our young (or young-lings as Star Wars will have it) take the longest of all to be independent. 

The advantage is that we can exploit nearly every situation or environment there is, from the arctic to the jungle, from hunter gathering to mega cities.

Humans (me and you) have adapted and more importantly will continue to do so. 

Now I find this idea a little intimidating. We will continue to adapt! That means that every thing we do, every thought we have, every behavior we express will lead to adaptation (to change). Doing nothing is not doing nothing it's active adaptation. 

So when we slump on the sofa it's not neutral it's an adaptation to slumping on the sofa. The same is true for; taking the car rather than cycling, being negative rather than positive, eating crap rather than something healthy, I'm sure you get the idea. 
We tend to become what we do, like the wake of a ship our actions have consequences that stream after us, this is part of the idea of Karma. 

But the positive expression of this is also really true, every time we make a better decision we adapt. That means that in a relatively short space of time we can change. We can be fitter, more flexible, happier or more positive (whatever your list looks like). 

For me the point is there is no neutral, we will adapt; we have no choice, we just need to keep actively choosing to make that a positive adaptation. 

It makes us responsible but also means we have an endless ability to get better, whatever that means to you.