Is crawling a new fitness trend? Some experts aren't sure whether it will catch on, but they call it an effective core workout -- if done right.
원문출처 : http://www.cnn.com/2016/11/16/health/crawling-exercise-fitness/index.html
원문출처 : http://www.cnn.com/2016/11/16/health/crawling-exercise-fitness/index.html