The simplest ansewer but the one we done like to hear is ourselves. We creat our limits, we stop when we get resistance or when things become difficult. We need to get out of our own way and just GO!! If you can imagine it and have the desire to live a certain lifestyle, make a plan and get after it. When resistance shows up, that means you are on the right path. When things seem impossible, go harder! Do not let let anything stand in the way of the amazing lifestyle you want to create. Resistance and limiting beliefs are like fire, they can either let it burn you, or spark you to go even harder after what you want. Which does it do for you?