Food donation can earn you a free class at Cross-Fit By Kelly Hockenberry, Columnist, The Times Do you know what I’d reallllly love for Christmas this year? Skinny thighs. Since this is a rather difficult thing for Santa to put under the tree, it may be up to me to figure out how to get them. The solution: CROSS FIT KENNETT SQUARE!  (located on Rosedale Road across from Legacy Fields) Cross...