I had the pleasure of talking with Jack many times over the years in radio interviews and what I always appreciated from him was this. He was always fun, positive, upbeat and instilled hope and motivated people to take care of them selves and that "Any thing is possible"
He appearances always garnered great response from listeners. Everyone has their own path and does the best that can at the moment. Imagine the millions, not an exaggerated number, millions of people that he may have motivated to get off their butts and move a little. That is good Karma and service.
Can we look at any of our lives, this and past, and see thousands of better choices we could have made? Certainly, absolutely without question is my answer. We learn by doing. Trial and success. There is always another step.