I agree, I especially notice it when forced to trudge up the stairs to exit the subway. When the stairs are crowded the pace is set by the slowest person on th

I agree, I especially notice it when forced to trudge up the stairs to exit the subway. When the stairs are crowded the pace is set by the slowest person on the staircase. On the rare occasions where I find the stairs empty, and I can run up, I find it less taxing.