I would disagree that all that any model of internal strength takes is focused intent. There is a skill component of intent that needs to 1) be learned/felt 2) grown and conditioned over time. There is also a raw physical conditioning component that needs to be trained alongside the focused intent piece that works together to rewire the body to carry itself and respond to outside forces differently.
I agree with what you are saying. I could have worded that much better. I guess what I meant to say is that Intent (the use of the dantien to balance opposing forces) is by far the most important piece of the puzzle. I can sit in my car and work on IP by using intent, but I agree you should probably get on a mat and do some work as well. Luckily, I am not in the same boat as some of the other poor saps in ATL who are possibly still sitting in their cars 24+ hours after our 2" winter storm...
Thanks for the clarification.