“…Many positive associations have been reported for each of these broad categories (eg, recreational availability [2][3][4][5][6], land use [7][8][9][10][11][12], neighborhood form [6,8,10,13], and community environment [10,11,[13][14][15][16][17][18][19]), but many null results also have been found [8,11,13,17,[19][20][21]. Several recent reviews have concluded that most studies examining the built environment and physical activity have had null associations [22,23].…”