How Walking and Cycling Quiets the Brain Imagine walking on a meandering forest path with intermittent bird song punctuating the quiet morning air. Sunlight is streaming through gaps in the forest canopy and as you move forward through space, you pass stands of pine trees on your left, a babbling brook on your right, then a picnic bench, some standing deadwood, a red squirrel, another hiker. This movement of objects past you as you walk