Starting small

The 4 Hour Body
Suggests starting very small.
If you wanted to write a book: write 2 pages a day.
If you want to run: run 5 minutes a day.
Your decisions will start to align and you will make healthy decisions as you start changing who you are.

So the first change that I'm doing is that:
I will put an ice pack on the back of my neck each day, once.

You have to buy the book to understand the science behind it.

In summary: do the minimum change.
It will start to build up like an avalanche.