What Boats Can We Burn?

I read a book last week called: Burn the Boats by Matt Higgins.  I have to admit it was a legend I had heard before that Julius Ceasar sailed his army to the Irish Coast and seeing that they were completely outnumbered Ceasar cut off their route to retreat by burning the boats that they had arrived in.  The strategy from the ancient text- the Art of War by Sun Tzu, that with no exit strategy an army would fight to the death with great courage.  I am not advocating anything even close to this, I am after all a big fan of health and safety and being alive.  However, lets think about changes and challenges in our lives.  I know I often commit to new habits and then quickly fall into my old ones again, because those comfortable habit boats are still within my reach. So if we think about the theory, what old warn getaways could we eliminate in order to make a lasing change that we know will make things better.  Change is hard, retreat is really just a way to go back to what we know, good or bad.  What boats can we burn?  In order to move on to something great with our whole hearts, can we make a big change?  I love the idea of small changes and tiny habits.  Working on a change is so hard, and the bigger the change the more effort.  What does it mean to no longer have an option to fall back on for retreat?  Full steam ahead to the new you, the new idea, the new routine, the new role, the new life.