The physical state of body affects embodied attitudes, which in turn affects behavior. And behavioral change involving the physical affects the body. If I run a mile every day my body will change. If I run a mile every day with my right hand in my pocket the change will be different.

Academics from different disciplines arelooking at the body-mind and mind-body effects of posture.   This European Journal of Social Psychology study looked at how body postures can influence self-evaluations by affecting thought confidence.

Subjects had to write down their best or worse qualities in a CONFIDENT posture ( sitting down with their back erect and pushing their chest out) or DOUBTFUL posture (slouched forward with their back curved).
THE CONCLUSION: "The direction of thoughts (positive/negative) on self-related attitudes was significantly greater when participants wrote their thoughts in the confident than in the doubtful posture*"

MY OBSERVATION: Physical change in body affects embodied attitudes.

*Body posture effects on self-evaluation: A self-validation approach Pablo Briñol1,*, Richard E. Petty2, Benjamin Wagner2 European Journal of Social Psychology Volume 39, Issue 6, pages 1053-1064, October 2009