What I call physical activity is limited to stowing my luggage into the overhead bin. I could include making the steep descent to the mailbox at the foot of our hill or climbing the stairs to my second-floor office. Rarely was my doctor amused during my annual checkups when these were my answers about regular exercise. A checkup two years ago was different. He wondered what I had been doing to reverse the annual weight gain, cholesterol increase, blood pressure rise. He remained in wonderment when I told him that, for three, months, I had been standing up during part of my workday.