In physical health, there is significant complexity at lower levels regarding individual differences in cardiac, muscle, and pulmonary function, with many potential choices for improvement.

“there's so much complexity on the initial levels right so we think about you know your physical health status versus mine right it's going to be different right we're going to have different cardiac function and muscle function and pulmonary function and if we're going to be healthy we could do a lot of different things right there might be a whole set of choices that would work well for you different choices that would work for me and we can gauge intensity timing frequency right it's very complicated when we're on the the lower levels of the hierarchy”